what heads @ can do I need to get my Lo3 @ 300whp?
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Car: 89 RS
Engine: 305 TBI (lo3)
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what heads @ can do I need to get my Lo3 @ 300whp?
Sorry for the title. Thought I typed "cam"
OK guys it's time to just come out with it. Been reading up all over the net about the Lo3, and I never find what im looking for so here goes.
I bought a 89 RS with a rebuilt 700r4 (shift kit), & a rebuilt Lo3. They are just past the break in. I need every HP/TQ that I can get out of this set up to make it worth driving (2 years= 200 miles). Their is no point in doing any work that will cost a lot, or why not swap with a 350. Every build I read about that is "budget" is not the direction I want to go.
All I need to know is what heads, & full roller cam are the best for the rest of the set up. I want to keep my car forever so the suspension will be re worked from the ground up. I can take care of that part as far as info goes. So I will start naming off parts that I know I want, to give a good idea in order to get the info I need for matched heads, & cam.
First off I will not get into the bottom end of this motor. I will not do anything to the stock tbi unit, except for the ultimate tbi mods. I will get a cawl hood to get cold air, & plumb it. I want edelbrock headers that have 3" collectors with no air tube (No sniff test in my state). I will find the sealed high flow cat. Three inch single pipe. Yes a muffler also. No worry. On the other side. I want a edelbrock performance rpm intake. Double roller timing set. Full upgrades on the ignition ect.
Did I leave anything out? Any info will help as I am lost on the rest. Thanks in advance for reading this, & for any help. Sorry its so long, but I have yet to find any info on the same setup since no one seems to want to build this motor. I have to. Im not rich, & the motor is like new. Thats my reasoning behind it.
OK guys it's time to just come out with it. Been reading up all over the net about the Lo3, and I never find what im looking for so here goes.
I bought a 89 RS with a rebuilt 700r4 (shift kit), & a rebuilt Lo3. They are just past the break in. I need every HP/TQ that I can get out of this set up to make it worth driving (2 years= 200 miles). Their is no point in doing any work that will cost a lot, or why not swap with a 350. Every build I read about that is "budget" is not the direction I want to go.
All I need to know is what heads, & full roller cam are the best for the rest of the set up. I want to keep my car forever so the suspension will be re worked from the ground up. I can take care of that part as far as info goes. So I will start naming off parts that I know I want, to give a good idea in order to get the info I need for matched heads, & cam.
First off I will not get into the bottom end of this motor. I will not do anything to the stock tbi unit, except for the ultimate tbi mods. I will get a cawl hood to get cold air, & plumb it. I want edelbrock headers that have 3" collectors with no air tube (No sniff test in my state). I will find the sealed high flow cat. Three inch single pipe. Yes a muffler also. No worry. On the other side. I want a edelbrock performance rpm intake. Double roller timing set. Full upgrades on the ignition ect.
Did I leave anything out? Any info will help as I am lost on the rest. Thanks in advance for reading this, & for any help. Sorry its so long, but I have yet to find any info on the same setup since no one seems to want to build this motor. I have to. Im not rich, & the motor is like new. Thats my reasoning behind it.
Last edited by STRIKER911; 01-28-2009 at 11:12 PM. Reason: more info
#2
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Re: what heads @ can do I need to get my Lo3 @ 300whp?
305 limits your choices. I assume you want higher compression? Most small Chev heads I see are 64cc or larger. My 350 with 64cc is at 9.8-10.0/1. Dart Iron Eagle makes a 49 cc head. Not sure what that will do for compression? World iron offers 58cc.
If you keep TBI a cam with a 112-115 LSA is what you want for computer friendly. Duration 216-222 at .05 may be where you want to be.
If you keep TBI a cam with a 112-115 LSA is what you want for computer friendly. Duration 216-222 at .05 may be where you want to be.
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Car: 91 Trans am
Engine: built 360 TBI
Transmission: built 700r4
Axle/Gears: 10bolt/3.23
Re: what heads @ can do I need to get my Lo3 @ 300whp?
Trik flow's aluminium cilider heads with 175cc intake ports and 56cc combustion chambers are tempting me.
By searchin tgo you will also find out that 059 vortec's are the best flowing stock heads for 305ci engines.
All other heads that are good for performance will require machine work and/or need porting.
Every mod will require a correct tune, at that point it will be nice to have the stock ECM upgraded with a EBL.
By searchin tgo you will also find out that 059 vortec's are the best flowing stock heads for 305ci engines.
All other heads that are good for performance will require machine work and/or need porting.
Every mod will require a correct tune, at that point it will be nice to have the stock ECM upgraded with a EBL.
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Car: 89 RS
Engine: 305 TBI (lo3)
Transmission: 700r4
Axle/Gears: Whatever is stock.
Re: what heads @ can do I need to get my Lo3 @ 300whp?
305 limits your choices. I assume you want higher compression? Most small Chev heads I see are 64cc or larger. My 350 with 64cc is at 9.8-10.0/1. Dart Iron Eagle makes a 49 cc head. Not sure what that will do for compression? World iron offers 58cc.
If you keep TBI a cam with a 112-115 LSA is what you want for computer friendly. Duration 216-222 at .05 may be where you want to be.
If you keep TBI a cam with a 112-115 LSA is what you want for computer friendly. Duration 216-222 at .05 may be where you want to be.
#5
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Car: 89 RS
Engine: 305 TBI (lo3)
Transmission: 700r4
Axle/Gears: Whatever is stock.
Re: what heads @ can do I need to get my Lo3 @ 300whp?
Trik flow's aluminium cilider heads with 175cc intake ports and 56cc combustion chambers are tempting me.
By searchin tgo you will also find out that 059 vortec's are the best flowing stock heads for 305ci engines.
All other heads that are good for performance will require machine work and/or need porting.
Every mod will require a correct tune, at that point it will be nice to have the stock ECM upgraded with a EBL.
By searchin tgo you will also find out that 059 vortec's are the best flowing stock heads for 305ci engines.
All other heads that are good for performance will require machine work and/or need porting.
Every mod will require a correct tune, at that point it will be nice to have the stock ECM upgraded with a EBL.
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Car: 91 Trans am
Engine: built 360 TBI
Transmission: built 700r4
Axle/Gears: 10bolt/3.23
Re: what heads @ can do I need to get my Lo3 @ 300whp?
World's s/r stock replacement 58cc. will require some good porting to perform.
Ported 081 's would probably perform better then ported S/R's.
I was just considering heads to achieve your hp goal.
Yes the T/F 's bite me all the time.
Ported 081 's would probably perform better then ported S/R's.
I was just considering heads to achieve your hp goal.
Yes the T/F 's bite me all the time.
Last edited by thomas1976; 01-29-2009 at 05:53 PM.
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Car: 89 RS
Engine: 305 TBI (lo3)
Transmission: 700r4
Axle/Gears: Whatever is stock.
Re: what heads @ can do I need to get my Lo3 @ 300whp?
Dang it. Did not know it took so much work to get 300hp out of this motor. I tried to sell it, but no takers. What if I use 081's with no porting? How much hp less do you think I will get? Maybe it doesn't cost a lot to port heads?
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Re: what heads @ can do I need to get my Lo3 @ 300whp?
Porting heads requires time and experience, neither of which tends to come cheaply.
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Car: 89 RS
Engine: 305 TBI (lo3)
Transmission: 700r4
Axle/Gears: Whatever is stock.
Re: what heads @ can do I need to get my Lo3 @ 300whp?
Ya thats what I thought. So what heads are the best to just bolt on? All "budget builds" are in fact done by people that have money or connections. I have none of both, so whatever I get, is just what I get. I would like nothing more then to drop in an ls-1, & t-56, but maybe one day. Until then I hate driving it, like it is. I had a 86 mustang that could out run this car by far. Its that bad that to find a mustang that I could keep up with in an 89 Camaro, I would have to run a 83 Mustang, and still have to have good luck. My dad has my old Mustang. HE put heads, & a cam in it for next to nothing. I want to runn him. My motor is even bigger, yet I have no chance. Thats just sad. Their has to be a way. Its war! lol.
#10
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Re: what heads @ can do I need to get my Lo3 @ 300whp?
I really wish I could get this stickied, but here you go.
https://www.thirdgen.org/forums/tbi/...-synopsis.html
https://www.thirdgen.org/forums/tbi/...-synopsis.html
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Car: 89 RS
Engine: 305 TBI (lo3)
Transmission: 700r4
Axle/Gears: Whatever is stock.
Re: what heads @ can do I need to get my Lo3 @ 300whp?
I really wish I could get this stickied, but here you go.
https://www.thirdgen.org/forums/tbi/...-synopsis.html
https://www.thirdgen.org/forums/tbi/...-synopsis.html
I have looked at that thread before too. Its 5 years old. The only intakes it talks about are ones with 2" runners. Then it goes into cams next. That's where I stopped reading, cause of the lack of new info as far as the newer parts go. This is why I keep having to post. I can not find the right info. Also the 7101 perf rpm says its for: "Fits 1955-1986, 262-400 cu.in. Chevrolet V8s". Mine is a 89
Last edited by STRIKER911; 01-29-2009 at 10:54 PM. Reason: more info.
#12
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Re: what heads @ can do I need to get my Lo3 @ 300whp?
Honestly I wouldn't go bigger than an 94 LT1 cam with the stock heads, reworked or not.
Here's a good list for you IMHO.
46mm throttle body (optional) or ultimate TBI mods
Vortec style RPM intake
059 vortec heads mildly worked over
ZZ4 cam with 1.6 intake and 1.5 exhaust or....
XFI268 cam
2800-3000 stall
3.73's with an EATON posi
and TUNING!!!!!!!!!!!!!!! that should get you in the ballpark I believe
Here's a good list for you IMHO.
46mm throttle body (optional) or ultimate TBI mods
Vortec style RPM intake
059 vortec heads mildly worked over
ZZ4 cam with 1.6 intake and 1.5 exhaust or....
XFI268 cam
2800-3000 stall
3.73's with an EATON posi
and TUNING!!!!!!!!!!!!!!! that should get you in the ballpark I believe
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Car: 84 TA / 89 Formula
Engine: LS1 / L03
Transmission: T56 / 700R4
Axle/Gears: 3.73 / 3.27
Re: what heads @ can do I need to get my Lo3 @ 300whp?
Ya thats what I thought. So what heads are the best to just bolt on? All "budget builds" are in fact done by people that have money or connections. I have none of both, so whatever I get, is just what I get. I would like nothing more then to drop in an ls-1, & t-56, but maybe one day. Until then I hate driving it, like it is. I had a 86 mustang that could out run this car by far. Its that bad that to find a mustang that I could keep up with in an 89 Camaro, I would have to run a 83 Mustang, and still have to have good luck. My dad has my old Mustang. HE put heads, & a cam in it for next to nothing. I want to runn him. My motor is even bigger, yet I have no chance. Thats just sad. Their has to be a way. Its war! lol.
you don't need that much money to build the tbi up! you just need to gain some overall knowledge about these engines before deciding to buy specific parts and then go on to do all the work yourself. the l03 is a great learner's engine, in my book. you will be able to apply this knowledge on other engines you will modify later as well. you could read some of the books out there, e.g. john lingenfelter's book on the SBC, or one of david vizards about valvetrain & heads to get some basic ideas. that's what i did and it helped a lot imho.
thomas, i think the same about these trickflows, they really sound great! got any cfm# on these? lol you made them bite me again for the next months
robertfrank, i agree with you on the sticky! have you pm'd one of the mods?
Last edited by ownor; 01-30-2009 at 03:12 AM.
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Car: 89 Formula
Engine: 350
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Re: what heads @ can do I need to get my Lo3 @ 300whp?
you'll never get 300 RWHP from an L03 (unless you have N02) Thats LS1 power. Stock your at what, 140-150 to the wheels?
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Re: what heads @ can do I need to get my Lo3 @ 300whp?
http://static.trickflow.com/global/i...75%20heads.pdf
Hope this helps
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Re: what heads @ can do I need to get my Lo3 @ 300whp?
Heres the thread Fast355 made for his 305:
https://www.thirdgen.org/forums/tbi/...ferrerid=35855
#17
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Re: what heads @ can do I need to get my Lo3 @ 300whp?
You can get 300rwhp from a 305, its just not cheap or easy. Fast 355 built a 305 that made 423fwhp and 417fwtq. Assuming 25% loss of power through the drivetrain you end up with 317.25rwhp & 312.75rwtq.
Heres the thread Fast355 made for his 305:
https://www.thirdgen.org/forums/tbi/...ferrerid=35855
Heres the thread Fast355 made for his 305:
https://www.thirdgen.org/forums/tbi/...ferrerid=35855
Also if you read the CHP build a few years ago they got 330fwhp out of a L03, granted if they read up on here I believe they could have gotten more out of it.
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Car: 1986 Camaro SC
Engine: Bolt-on/cam 305
Transmission: 700R4 w/ 2500stall
Axle/Gears: 3.73 10bolt Posi
Re: what heads @ can do I need to get my Lo3 @ 300whp?
Why not go with the SDPC vortec heads setup for .525" lift w/ the TBI manifold. Have the heads machined down a bit and run a thin head gasket to bring the compression up. Then run the suggested xe268 cam - there was a car mag that made 372fwhp w/ that setup with a carb, even assume that a bit optimistic you ought to be able to find 300rwhp with something along those lines.
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Car: 1986 Camaro SC
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Axle/Gears: 3.73 10bolt Posi
Re: what heads @ can do I need to get my Lo3 @ 300whp?
http://www.sdpc2000.com/product/SD80...keHeaders.aspx
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Car: 89 RS
Engine: 305 TBI (lo3)
Transmission: 700r4
Axle/Gears: Whatever is stock.
Re: what heads @ can do I need to get my Lo3 @ 300whp?
Honestly I wouldn't go bigger than an 94 LT1 cam with the stock heads, reworked or not.
Here's a good list for you IMHO.
46mm throttle body (optional) or ultimate TBI mods
Vortec style RPM intake
059 vortec heads mildly worked over
ZZ4 cam with 1.6 intake and 1.5 exhaust or....
XFI268 cam
2800-3000 stall
3.73's with an EATON posi
and TUNING!!!!!!!!!!!!!!! that should get you in the ballpark I believe
Here's a good list for you IMHO.
46mm throttle body (optional) or ultimate TBI mods
Vortec style RPM intake
059 vortec heads mildly worked over
ZZ4 cam with 1.6 intake and 1.5 exhaust or....
XFI268 cam
2800-3000 stall
3.73's with an EATON posi
and TUNING!!!!!!!!!!!!!!! that should get you in the ballpark I believe
#22
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Car: 89 RS
Engine: 305 TBI (lo3)
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Re: what heads @ can do I need to get my Lo3 @ 300whp?
Check this link out - SDPC sells it as a package, manifold and vortec heads good for .525 lift.
http://www.sdpc2000.com/product/SD80...keHeaders.aspx
http://www.sdpc2000.com/product/SD80...keHeaders.aspx
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Car: 91 Trans am
Engine: built 360 TBI
Transmission: built 700r4
Axle/Gears: 10bolt/3.23
Re: what heads @ can do I need to get my Lo3 @ 300whp?
I kinda agree, there isent much left of the original LO3 at that point.
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Re: what heads @ can do I need to get my Lo3 @ 300whp?
#26
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Car: 89 RS
Engine: 305 TBI (lo3)
Transmission: 700r4
Axle/Gears: Whatever is stock.
Re: what heads @ can do I need to get my Lo3 @ 300whp?
1). My car has been rebuilt so I have no idea what is inside it.
2). I think my motor came stock with the roller cam, & flat piston's? Here is what they said about it. "Some of the high-end 305s came with flat-top pistons for more compression ratio, as well as factory hydraulic roller cam setups".
My car is an 89. Do you think that it will make a difference in anyway? I think the compression would not be the same. This part of motors is Chinese to me. That's the hard part. Reason I pull my hair out. I looked up that same page a while ago, as well as many others, & their is always something that to me makes the info worthless. Maybe you can help put my mind around that build if you where to say that it makes no difference that my motor is not the same? Honest this is why I am here. To find this stuff out. Can I use my compression tester to find out the compression that my motor has? If so, how? Thanks for the help. Its hard for me to ask just what someone needs, that knows whats up so thanks for the patience.
I am adding as I am reading. That motor made over 220hp on the dyno in stock form. Mine has 170. Also the test motor had a flat-tappet cam that I am told mine does not have. I also do not want a carb. Seen to many shoot fire, plus I am not wanting to tune a carb once a month.
Last edited by STRIKER911; 01-31-2009 at 02:05 AM. Reason: more info
#27
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Re: what heads @ can do I need to get my Lo3 @ 300whp?
http://www.chevyhiperformance.com/te..._ii/index.html
#28
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Re: what heads @ can do I need to get my Lo3 @ 300whp?
That is a very nice build. Again not the same starting point as my motor for two reasons. The first I am unsure about.
1). My car has been rebuilt so I have no idea what is inside it.
2). I think my motor came stock with the roller cam, & flat piston's? Here is what they said about it. "Some of the high-end 305s came with flat-top pistons for more compression ratio, as well as factory hydraulic roller cam setups".
My car is an 89. Do you think that it will make a difference in anyway? I think the compression would not be the same. This part of motors is Chinese to me. That's the hard part. Reason I pull my hair out. I looked up that same page a while ago, as well as many others, & their is always something that to me makes the info worthless. Maybe you can help put my mind around that build if you where to say that it makes no difference that my motor is not the same? Honest this is why I am here. To find this stuff out. Can I use my compression tester to find out the compression that my motor has? If so, how? Thanks for the help. Its hard for me to ask just what someone needs, that knows whats up so thanks for the patience.
I am adding as I am reading. That motor made over 220hp on the dyno in stock form. Mine has 170. Also the test motor had a flat-tappet cam that I am told mine does not have. I also do not want a carb. Seen to many shoot fire, plus I am not wanting to tune a carb once a month.
1). My car has been rebuilt so I have no idea what is inside it.
2). I think my motor came stock with the roller cam, & flat piston's? Here is what they said about it. "Some of the high-end 305s came with flat-top pistons for more compression ratio, as well as factory hydraulic roller cam setups".
My car is an 89. Do you think that it will make a difference in anyway? I think the compression would not be the same. This part of motors is Chinese to me. That's the hard part. Reason I pull my hair out. I looked up that same page a while ago, as well as many others, & their is always something that to me makes the info worthless. Maybe you can help put my mind around that build if you where to say that it makes no difference that my motor is not the same? Honest this is why I am here. To find this stuff out. Can I use my compression tester to find out the compression that my motor has? If so, how? Thanks for the help. Its hard for me to ask just what someone needs, that knows whats up so thanks for the patience.
I am adding as I am reading. That motor made over 220hp on the dyno in stock form. Mine has 170. Also the test motor had a flat-tappet cam that I am told mine does not have. I also do not want a carb. Seen to many shoot fire, plus I am not wanting to tune a carb once a month.
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Re: what heads @ can do I need to get my Lo3 @ 300whp?
They were making 220fwhp in stock form because they stripped all the accessories/EGR&AIR off and used an electric waterpump. As you can also see from the picks, that isn't a stock exhaust manifold either, if I'm correct those are full length headers. Add all that stuff back on and use the stock boat anchor exhaust manifold and thats how you make 170fwhp.
#30
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Re: what heads @ can do I need to get my Lo3 @ 300whp?
I would steer clear of the Edelbrock headers, they suck compared to other options available. I bought a set, looked like a 10 year old put them together, so I got rid of them. Overall, they are just a bad design. If you search the exhaust forums, I think you will find something better suited for your build than the Edelbrock!!!
I'm surprised no one else brought this up already!
I'm surprised no one else brought this up already!
Last edited by krisb410; 01-31-2009 at 07:03 PM.
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Car: 93 Formula,88 T/A,01 WS6
Engine: 93 LT1,88TPI305,01 LS1
Transmission: 93 700R4,88 700R4,01 T56
Axle/Gears: 93 3:73's,88 3:42,01 3:40
Re: what heads @ can do I need to get my Lo3 @ 300whp?
EngineQuest Lightning heads, Compcams 26918 springs,XE268H cam. 1.94/1.50 valves,Edlbrock performer RPM air gap intake,650 speed demon carb as per Camaro Performers mag. May 2007 372Hp at crank at 6100 Rpm,peak torque 221 at 5000 Rpms. Look it up see what you find
#32
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Car: 89 RS
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Re: what heads @ can do I need to get my Lo3 @ 300whp?
I would steer clear of the Edelbrock headers, they suck compared to other options available. I bought a set, looked like a 10 year old put them together, so I got rid of them. Overall, they are just a bad design. If you search the exhaust forums, I think you will find something better suited for your build than the Edelbrock!!!
I'm surprised no one else brought this up already!
I'm surprised no one else brought this up already!
#33
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Axle/Gears: Whatever is stock.
Re: what heads @ can do I need to get my Lo3 @ 300whp?
Your car had the regular dished pistons that came with the motor that they were using and your car stock is a roller motor. Your engine stock should has 9.5:1 compression IIRC so if changing out the heads try to aim for the same or 10.1 for alittle more power. Just be sure your tuning is right and use premium fuel. When your motor was rebuilt they probably use a stock rebuild kit with standard .0039 (?) headgaskets so I wouldn't worry to much.
#35
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Car: 84 TA / 89 Formula
Engine: LS1 / L03
Transmission: T56 / 700R4
Axle/Gears: 3.73 / 3.27
Re: what heads @ can do I need to get my Lo3 @ 300whp?
Your car had the regular dished pistons that came with the motor that they were using and your car stock is a roller motor. Your engine stock should has 9.5:1 compression IIRC so if changing out the heads try to aim for the same or 10.1 for alittle more power. Just be sure your tuning is right and use premium fuel. When your motor was rebuilt they probably use a stock rebuild kit with standard .0039 (?) headgaskets so I wouldn't worry to much.
9.5:1 was only achieved with the flat-top pistons used in the L69 (HO) and the LU5 (CFI), which despite being early 82-84 stuff were both using ESC already. afaik, about all 305 heads in the 3rdgen have a 58cc (forget the 601 heads for a sec). the standard head gasket is 0.039".
here is a good compression ratio calculator, but there are a couple of more variables to use it:
http://kb-silvolite.com/calc.php?action=comp
deck clearance is usually about 0.025" (piston down in the hole), i can't tell you the cc of the piston dish though.
edit: here's another calculator which appears to be more basic.
http://www.torinocobra.com/Randys_tools.htm
i just read that. what tha hell, 221 peak tq.. i hope that is a typo!?
Last edited by ownor; 02-01-2009 at 11:23 AM.
#36
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Car: 89 RS
Engine: 305 TBI (lo3)
Transmission: 700r4
Axle/Gears: Whatever is stock.
Re: what heads @ can do I need to get my Lo3 @ 300whp?
the L03 used only slightly dished pistons compared to the pre-87 dished pistons (yielding 8.6:1 in earlier LG4s) and the slightly dished ones yielding a bit more compression at 9.3:1 (like in the 87 LG4, they added ESC in this year to handle knocks). all 305 from 88-up were using this exact bottom end.
9.5:1 was only achieved with the flat-top pistons used in the L69 (HO) and the LU5 (CFI), which despite being early 82-84 stuff were both using ESC already. afaik, about all 305 heads in the 3rdgen have a 58cc (forget the 601 heads for a sec). the standard head gasket is 0.039".
here is a good compression ratio calculator, but there are a couple of more variables to use it:
http://kb-silvolite.com/calc.php?action=comp
deck clearance is usually about 0.025" (piston down in the hole), i can't tell you the cc of the piston dish though.
edit: here's another calculator which appears to be more basic.
http://www.torinocobra.com/Randys_tools.htm
i just read that. what tha hell, 221 peak tq.. i hope that is a typo!?
9.5:1 was only achieved with the flat-top pistons used in the L69 (HO) and the LU5 (CFI), which despite being early 82-84 stuff were both using ESC already. afaik, about all 305 heads in the 3rdgen have a 58cc (forget the 601 heads for a sec). the standard head gasket is 0.039".
here is a good compression ratio calculator, but there are a couple of more variables to use it:
http://kb-silvolite.com/calc.php?action=comp
deck clearance is usually about 0.025" (piston down in the hole), i can't tell you the cc of the piston dish though.
edit: here's another calculator which appears to be more basic.
http://www.torinocobra.com/Randys_tools.htm
i just read that. what tha hell, 221 peak tq.. i hope that is a typo!?
#37
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Car: 2003 F-150
Engine: 4.6L Modular V8
Transmission: 4R70W
Axle/Gears: Ford 8.8"/3.55 LSD
Re: what heads @ can do I need to get my Lo3 @ 300whp?
Thanks for the info. Easy to use chart. I guess the only way to figure out The true numbers is to take the motor apart, & measure everything. I hate to do that. Is this a step that anyone has skipped, by guessing? Also thought the 220tq has to be wrong. They make that much stock dont they.
Yes the LO3 makes 255fwtq stock.
#38
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Car: 84 TA / 89 Formula
Engine: LS1 / L03
Transmission: T56 / 700R4
Axle/Gears: 3.73 / 3.27
Re: what heads @ can do I need to get my Lo3 @ 300whp?
as for the one calc from torinocobra posted above:
bore is likely to be different from stock (3.736") so you might just try 3.766 as already said by 89_R
stroke is 3.48" on 305 & 350
cylinders i hope you dont mind if i leave that one out
head gasket stock ones are 0.039" thick
head gasket bore most are 4.1" - 4.2" but it doesn't matter much anyways
cylinder head chamber volume unless your heads were milled they still have about 58cc
piston deck height nominal 0.025 stock but again, you never know..
piston dome/dish volume ANYONE? i know that the flat-tops have 6cc valve reliefs, but dunno the cc of the L03 piston dish.. (prolly about 10cc)
ring height and skirt clearance are imho useless in a CR calculation (as are cylinders)
again, if something has been changed during the rebuild you'll never know its specs until you dig in there and measure everything.
btw, i get 2 minimal different results comparing these two calculators ~~
sorry for the confusion..
i agree, you'll get close, but since you'll be tearing that thing apart anyway, you can make sure to measure the crap out of that engine
peak tq of the Camaro Performance buildup is even rated at the double rpm of the stock L03 peak tq Oo
anyways, it must be a typo.. google couldn't tell me anything about this buildup either
bore is likely to be different from stock (3.736") so you might just try 3.766 as already said by 89_R
stroke is 3.48" on 305 & 350
cylinders i hope you dont mind if i leave that one out
head gasket stock ones are 0.039" thick
head gasket bore most are 4.1" - 4.2" but it doesn't matter much anyways
cylinder head chamber volume unless your heads were milled they still have about 58cc
piston deck height nominal 0.025 stock but again, you never know..
piston dome/dish volume ANYONE? i know that the flat-tops have 6cc valve reliefs, but dunno the cc of the L03 piston dish.. (prolly about 10cc)
ring height and skirt clearance are imho useless in a CR calculation (as are cylinders)
again, if something has been changed during the rebuild you'll never know its specs until you dig in there and measure everything.
btw, i get 2 minimal different results comparing these two calculators ~~
sorry for the confusion..
peak tq of the Camaro Performance buildup is even rated at the double rpm of the stock L03 peak tq Oo
anyways, it must be a typo.. google couldn't tell me anything about this buildup either
Last edited by ownor; 02-01-2009 at 03:51 PM.
#39
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Car: 89 RS
Engine: 305 TBI (lo3)
Transmission: 700r4
Axle/Gears: Whatever is stock.
Re: what heads @ can do I need to get my Lo3 @ 300whp?
as for the one calc from torinocobra posted above:
bore is likely to be different from stock (3.736") so you might just try 3.766 as already said by 89_R
stroke is 3.48" on 305 & 350
cylinders i hope you dont mind if i leave that one out
head gasket stock ones are 0.039" thick
head gasket bore most are 4.1" - 4.2" but it doesn't matter much anyways
cylinder head chamber volume unless your heads were milled they still have about 58cc
piston deck height nominal 0.025 stock but again, you never know..
piston dome/dish volume ANYONE? i know that the flat-tops have 6cc valve reliefs, but dunno the cc of the L03 piston dish.. (prolly about 10cc)
ring height and skirt clearance are imho useless in a CR calculation (as are cylinders)
again, if something has been changed during the rebuild you'll never know its specs until you dig in there and measure everything.
btw, i get 2 minimal different results comparing these two calculators ~~
sorry for the confusion..
i agree, you'll get close, but since you'll be tearing that thing apart anyway, you can make sure to measure the crap out of that engine
peak tq of the Camaro Performance buildup is even rated at the double rpm of the stock L03 peak tq Oo
anyways, it must be a typo.. google couldn't tell me anything about this buildup either
bore is likely to be different from stock (3.736") so you might just try 3.766 as already said by 89_R
stroke is 3.48" on 305 & 350
cylinders i hope you dont mind if i leave that one out
head gasket stock ones are 0.039" thick
head gasket bore most are 4.1" - 4.2" but it doesn't matter much anyways
cylinder head chamber volume unless your heads were milled they still have about 58cc
piston deck height nominal 0.025 stock but again, you never know..
piston dome/dish volume ANYONE? i know that the flat-tops have 6cc valve reliefs, but dunno the cc of the L03 piston dish.. (prolly about 10cc)
ring height and skirt clearance are imho useless in a CR calculation (as are cylinders)
again, if something has been changed during the rebuild you'll never know its specs until you dig in there and measure everything.
btw, i get 2 minimal different results comparing these two calculators ~~
sorry for the confusion..
i agree, you'll get close, but since you'll be tearing that thing apart anyway, you can make sure to measure the crap out of that engine
peak tq of the Camaro Performance buildup is even rated at the double rpm of the stock L03 peak tq Oo
anyways, it must be a typo.. google couldn't tell me anything about this buildup either
#40
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Car: 84 TA / 89 Formula
Engine: LS1 / L03
Transmission: T56 / 700R4
Axle/Gears: 3.73 / 3.27
Re: what heads @ can do I need to get my Lo3 @ 300whp?
hmm i thought you were planning to do a head swap? if you're actually taking these off you can measure all the mentioned variables, piston dish, deck clearance, chambe cc, bore size, etc!
#43
Re: what heads @ can do I need to get my Lo3 @ 300whp?
May be you can help me out? I have a small block crate motor with some mods. I currently have an MSD 6al box, hooker shorty headers,performer carb and intake, and a built up 700R4 with a shift kit. I have some 202 double hump heads im gonna put on it in a week or two. Im wondering what would be a good intake and cam combination. I dont want to push my car past around 5500 RPM. I think it would let go. I need a cam and intake that make power from 1500 to 6500 RPM. What do you think would work well with these heads and numbers.
#45
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Car: 84 TA / 89 Formula
Engine: LS1 / L03
Transmission: T56 / 700R4
Axle/Gears: 3.73 / 3.27
Re: what heads @ can do I need to get my Lo3 @ 300whp?
May be you can help me out? I have a small block crate motor with some mods. I currently have an MSD 6al box, hooker shorty headers,performer carb and intake, and a built up 700R4 with a shift kit. I have some 202 double hump heads im gonna put on it in a week or two. Im wondering what would be a good intake and cam combination. I dont want to push my car past around 5500 RPM. I think it would let go. I need a cam and intake that make power from 1500 to 6500 RPM. What do you think would work well with these heads and numbers.
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