LO3 To L30 Vortec Swap: Completed(Mostly)
#51
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Re: Which LO5 do I use?
Those specs have been around well before I bought the engine. That being said 810s are the later version of the 191 heads. I am not going to argue with you either. The 20270 and 283 both had forged crankshafts. You can argue all you want, I don't care. The 8,800+ GVW engines were designed to run at wide open throttle pulling a heavy loaded truck and trailer. They are overbuilt for what they are doing for a reason. 4 bolt mains and forged crank. The 99 2500 Express 4 bolt main short block in my brothers garage has a forged crank too.
Oh and here is another link stating the 191s are 64cc, more like 65.3 that EVERY 350 TBI head is. 193/191/810 they all have the same chamber.
http://www.hotrodders.com/forum/sbc-...ccs-22481.html
Then factor in that cam matches NOTHING GM ever built, it just tells me that information is flat WRONG.
Or here maybe you will believe a machine shop....
http://www.ebay.com/itm/14102191-Sto...-/261353790882
I ask you again to please take down atleast your wrong cylinder head information. I have seen the wrong information get a racer disqualified and accused of cheating. Only to find out he had done NOTHING wrong. Mortec used to list the 14022601 305 HO heads as being 58cc when in reality they are 53cc. A dirt track racer I know was challenged and had to tear down his engine. I took the numbers on paper that a machine shop had given me when they cc'd my stock 601 heads prior to milling the heads and save his reputation. So once again, be careful posting WRONG information.
Oh and here is another link stating the 191s are 64cc, more like 65.3 that EVERY 350 TBI head is. 193/191/810 they all have the same chamber.
http://www.hotrodders.com/forum/sbc-...ccs-22481.html
Then factor in that cam matches NOTHING GM ever built, it just tells me that information is flat WRONG.
Or here maybe you will believe a machine shop....
http://www.ebay.com/itm/14102191-Sto...-/261353790882
I ask you again to please take down atleast your wrong cylinder head information. I have seen the wrong information get a racer disqualified and accused of cheating. Only to find out he had done NOTHING wrong. Mortec used to list the 14022601 305 HO heads as being 58cc when in reality they are 53cc. A dirt track racer I know was challenged and had to tear down his engine. I took the numbers on paper that a machine shop had given me when they cc'd my stock 601 heads prior to milling the heads and save his reputation. So once again, be careful posting WRONG information.
#52
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Re: Which LO5 do I use?
You're WARY of the cam, not weary.
You'd have to be nuts to put another 305 back in. Both engines use flat-tapppet cams. There is some cause for concern, but don't obsess: the valve springs aren't stiff enough to make cam wear a deal-breaker.
But the power and roller cam are both long-term joys that will remain long after you've paid off the engine.
You'd have to be nuts to put another 305 back in. Both engines use flat-tapppet cams. There is some cause for concern, but don't obsess: the valve springs aren't stiff enough to make cam wear a deal-breaker.
But the power and roller cam are both long-term joys that will remain long after you've paid off the engine.
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Re: Which LO5 do I use?
To be clear,I'm not concerned with who's rite,or,who's wrong here.My concern is that you are telling a person if they spend $2000 to buy this engine,they will have a forged crank & that is totally not true.They will not have a forged crank.The heads are listed all over the internet as 64cc,65cc,& 76 cc,so,that's not totally clear.When you remove your wrong info about a forged crank,or,show some proof as to your claim,my info stays as is.An Ebay seller is no more a realiable source than your forum post.He is just as likely to be wrong as you are.He coulda got his info from the same place you did.The internet.I would rather believe Pace,or,a GM parts dept over you.or,either of your sources. You need to be careful as well for posting WRONG info.If you wanna state that your engine has a forged crank,then,do so,but,don't tell a person to spend $2000 for an engine that has a forged crank when it definitely does not !!!!
http://chicagoengines.com/engines/gm...C5506-426.aspx
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Re: Which LO5 do I use?
HERE YOU GO...Yet another site proving me right on the forged crankshaft. Look at what crankshaft number they run. Number is 14088532
http://chicagoengines.com/engines/gm...C5506-426.aspx
http://chicagoengines.com/engines/gm...C5506-426.aspx
Last edited by jokerZ71; 02-06-2014 at 01:15 PM.
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Re: Which LO5 do I use?
Even the L30/305 would be a major improvement over the L03,or,L05.You would still have the intake issue tho.
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Re: Which LO5 do I use?
Fast,i don't wanna waste anymore time over this.The only reason I ever got into this is becuz you advised the OP to buy the #12520270 4bolt engine & he would receive an engine with a forged crank & that is just downrite wrong info.I don't doubt that your engine has a forged crank.I don't doubt that an L05 engine can be had with a forged crank,but,between the 2 engines linked @ the beginning of this thread,niether has a forged crank,nor,does the 4 bolt L31 HD sold under #12530283.As for the cylinder heads,all realiable info I have states that the #191 head is a 76cc head.If you can provide realiable info otherwise,then so be it.I am done with this tho.Both sides have had their say,so,if someone ends up a yr from now on this thread thru a search,@ least they will know to verify the specs before spending their money & being disappointed.I mean no disrespect to you in anyway.I just disagree.
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Car: 1989 Chevy Camaro RS
Engine: L30 TBI 5.0L Vortec
Transmission: 700R4
Axle/Gears: Stock
I was under the impression the lo3 is a roller cam. The added cost of the L31 is around 200 for the mani, 50 for the adaptor, and uknown amount for tuning which I have almost no desire to learn and still new injectors, knock sensor etc. Thats more than a small difference. I was thinking of going LO3 purely for simplicity. Then later on added a set of headers for a boost in power
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Re: Which LO5 do I use?
I was under the impression the lo3 is a roller cam. The added cost of the L31 is around 200 for the mani, 50 for the adaptor, and uknown amount for tuning which I have almost no desire to learn and still new injectors, knock sensor etc. Thats more than a small difference. I was thinking of going LO3 purely for simplicity. Then later on added a set of headers for a boost in power
#60
Re: Which LO5 do I use?
It's not available NEW. There's millions of them used or rebuilt.
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Re: Which LO5 do I use?
Nuthin wrong with a good quality rebuilt motor that has a good warranty.What you wanna watch for tho is builders who use the cheaper "rebuilders pistons"that have a 1.54" pin hgt vs a 1.56" pin hgt.The shorter piston will have your pistons .045" in the hole on an undecked block.This will lower your compression ratio,lower your power,& will offer practically no quench effect to fight against detonation.It's definitely an idea worth lookin into.By asking the rite questions from the rebuilder,you can tell if your getting a good deal.Ask for piston part#'s & ck the specs yourself.Ask which thickness headgasket was used & what the deck hgt is so you know your quench/squish & actual CR.Ask for the camshaft specs so you can figure the DCR of the engine.If the builder can't,or,won't answer these question,or,if he tells you none of that matters,find another builder.
Last edited by jokerZ71; 02-06-2014 at 09:03 PM.
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Re: Which LO5 do I use?
That would be a good option to consider.
Last edited by jokerZ71; 02-06-2014 at 09:12 PM.
#64
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Car: 1989 Chevy Camaro RS
Engine: L30 TBI 5.0L Vortec
Transmission: 700R4
Axle/Gears: Stock
How about this gem? Its a 305 vortec L30 w/roller cam and definitely more in my price range. 230 hp is a good boost
http://www.jegs.com/i/Chevrolet-Perf...30284/10002/-1
I think I'm sold on this one
http://www.jegs.com/i/Chevrolet-Perf...30284/10002/-1
I think I'm sold on this one
Last edited by RS-Chevy-SS; 06-29-2014 at 04:59 PM.
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Re: Which LO5 do I use?
That in an earlier post.That is the little brother to the L31.It uses the same roller cam as the L31.The heads don't have a true fastburn chamber like the L31,but,it is probably the best OEM 305 head available.It flows about 220 cfm @ .500 lift.You will need to use the timing cover from your L03 & as you already know,you will need a Vortec intake.If you want,or,need to retain EGR,you will need a driverside Vortec exhaust manifold,or,headers to plumb it up.If not,simply delete it in your tune.Due to the improved head flow & cam specs,you will need some tuning for optimum results.This would still be a big improvement over the L03,or,L05.
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Yes.I had actually recommended
That in an earlier post.That is the little brother to the L31.It uses the same roller cam as the L31.The heads don't have a true fastburn chamber like the L31,but,it is probably the best OEM 305 head available.It flows about 220 cfm @ .500 lift.You will need to use the timing cover from your L03 & as you already know,you will need a Vortec intake.If you want,or,need to retain EGR,you will need a driverside Vortec exhaust manifold,or,headers to plumb it up.If not,simply delete it in your tune.Due to the improved head flow & cam specs,you will need some tuning for optimum results.This would still be a big improvement over the L03,or,L05.
That in an earlier post.That is the little brother to the L31.It uses the same roller cam as the L31.The heads don't have a true fastburn chamber like the L31,but,it is probably the best OEM 305 head available.It flows about 220 cfm @ .500 lift.You will need to use the timing cover from your L03 & as you already know,you will need a Vortec intake.If you want,or,need to retain EGR,you will need a driverside Vortec exhaust manifold,or,headers to plumb it up.If not,simply delete it in your tune.Due to the improved head flow & cam specs,you will need some tuning for optimum results.This would still be a big improvement over the L03,or,L05.
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Re: Which LO5 do I use?
The Vortec engines use a plastic timing cover with a port & spacing for the crank sensor & a reluctor wheel.The cover from your L03 will work.Any Vortec carb intake for an SBC will work.I like the Performer RPM myself.The 230 HP rating is as installed in an original vehicle with the Vortec fuel system which is somewhat better than the TBI.With some TBI mods tho,you should be close to that easily.Maybe even a little more becuz that is SAE net rating.With a good intake,headers,& tuning you should be well over that.You exhaust will work tho if needed to.I'll look around @ some intakes & post back.Bedtime has arrived.4 am gets here kinda early.LOL.
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Car: 1989 Chevy Camaro RS
Engine: L30 TBI 5.0L Vortec
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Re: Which LO5 do I use?
The Vortec engines use a plastic timing cover with a port & spacing for the crank sensor & a reluctor wheel.The cover from your L03 will work.Any Vortec carb intake for an SBC will work.I like the Performer RPM myself.The 230 HP rating is as installed in an original vehicle with the Vortec fuel system which is somewhat better than the TBI.With some TBI mods tho,you should be close to that easily.Maybe even a little more becuz that is SAE net rating.With a good intake,headers,& tuning you should be well over that.You exhaust will work tho if needed to.I'll look around @ some intakes & post back.Bedtime has arrived.4 am gets here kinda early.LOL.
Intake
http://www.summitracing.com/parts/pfs-52007/overview/
Adapter
http://www.summitracing.com/parts/trd-2200/overview/
#74
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Re: Which LO5 do I use?
Wow that's early. Did some searching and I want to mate that L30 up to the intake mani linked below and use the linked TBI adapter. Thoughts?
Intake
http://www.summitracing.com/parts/pfs-52007/overview/
Adapter
http://www.summitracing.com/parts/trd-2200/overview/
Intake
http://www.summitracing.com/parts/pfs-52007/overview/
Adapter
http://www.summitracing.com/parts/trd-2200/overview/
Last edited by jokerZ71; 02-07-2014 at 05:06 AM.
#75
Re: Which LO5 do I use?
I want to mate that L30 up to the intake mani linked below and use the linked TBI adapter. Thoughts?
Intake
http://www.summitracing.com/parts/pfs-52007/overview/
Adapter
http://www.summitracing.com/parts/trd-2200/overview/
Intake
http://www.summitracing.com/parts/pfs-52007/overview/
Adapter
http://www.summitracing.com/parts/trd-2200/overview/
#76
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Re: Which LO5 do I use?
The Summit Stage 1 square bore intake (#SUM-226018) sells for $144.
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Re: Which LO5 do I use?
The Vortec engines use a plastic timing cover with a port & spacing for the crank sensor & a reluctor wheel.The cover from your L03 will work.Any Vortec carb intake for an SBC will work.I like the Performer RPM myself.The 230 HP rating is as installed in an original vehicle with the Vortec fuel system which is somewhat better than the TBI.With some TBI mods tho,you should be close to that easily.Maybe even a little more becuz that is SAE net rating.With a good intake,headers,& tuning you should be well over that.You exhaust will work tho if needed to.I'll look around @ some intakes & post back.Bedtime has arrived.4 am gets here kinda early.LOL.
The GMPP TBI performance intake does not become a noticeable restriction until you pass over 250-260 RWHP on a 350. With less cylinder volume to fill it should work well on a street driven 305. The mission 305 car put down like 257 RWHP with a set of milled 062s, the GMPP intake, headers, exhaust, a mild cam and tuning.
Keep in mind the stock 305 injectors are pretty much maxed out at the 170 HP rating of the L03 at stock fuel pressure. He is going to need to bump up to some 350 injectors at about 14-15 psi to feed the engine. That will require prom tuning. The Vortec is also going to want more timing advance than the L03 ever thought about at both part throttle and WOT.
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Re: Which LO5 do I use?
You must be kidding....The CSFI vortec intake with all the trash in the plenum is a DOG as far as performance goes. The only thing going for it is sequential port fuel injection. I pulled the CSFI intake off my 350 and put the L31 marine intake in its place and gained a good 500 rpm of useable powerband up top.
The GMPP TBI performance intake does not become a noticeable restriction until you pass over 250-260 RWHP on a 350. With less cylinder volume to fill it should work well on a street driven 305. The mission 305 car put down like 257 RWHP with a set of milled 062s, the GMPP intake, headers, exhaust, a mild cam and tuning.
Keep in mind the stock 305 injectors are pretty much maxed out at the 170 HP rating of the L03 at stock fuel pressure. He is going to need to bump up to some 350 injectors at about 14-15 psi to feed the engine. That will require prom tuning. The Vortec is also going to want more timing advance than the L03 ever thought about at both part throttle and WOT.
The GMPP TBI performance intake does not become a noticeable restriction until you pass over 250-260 RWHP on a 350. With less cylinder volume to fill it should work well on a street driven 305. The mission 305 car put down like 257 RWHP with a set of milled 062s, the GMPP intake, headers, exhaust, a mild cam and tuning.
Keep in mind the stock 305 injectors are pretty much maxed out at the 170 HP rating of the L03 at stock fuel pressure. He is going to need to bump up to some 350 injectors at about 14-15 psi to feed the engine. That will require prom tuning. The Vortec is also going to want more timing advance than the L03 ever thought about at both part throttle and WOT.
#79
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Car: 1989 Chevy Camaro RS
Engine: L30 TBI 5.0L Vortec
Transmission: 700R4
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So this intake will work with the adapter I linked early? Its cheaper too so im good with that.
You must be kidding....The CSFI vortec intake with all the trash in the plenum is a DOG as far as performance goes. The only thing going for it is sequential port fuel injection. I pulled the CSFI intake off my 350 and put the L31 marine intake in its place and gained a good 500 rpm of useable powerband up top.
The GMPP TBI performance intake does not become a noticeable restriction until you pass over 250-260 RWHP on a 350. With less cylinder volume to fill it should work well on a street driven 305. The mission 305 car put down like 257 RWHP with a set of milled 062s, the GMPP intake, headers, exhaust, a mild cam and tuning.
Keep in mind the stock 305 injectors are pretty much maxed out at the 170 HP rating of the L03 at stock fuel pressure. He is going to need to bump up to some 350 injectors at about 14-15 psi to feed the engine. That will require prom tuning. The Vortec is also going to want more timing advance than the L03 ever thought about at both part throttle and WOT. So what do you suggest fast? 350 injectors still? Tuning is going to be taken care of by Tuned Performance he is a vendor here
You must be kidding....The CSFI vortec intake with all the trash in the plenum is a DOG as far as performance goes. The only thing going for it is sequential port fuel injection. I pulled the CSFI intake off my 350 and put the L31 marine intake in its place and gained a good 500 rpm of useable powerband up top.
The GMPP TBI performance intake does not become a noticeable restriction until you pass over 250-260 RWHP on a 350. With less cylinder volume to fill it should work well on a street driven 305. The mission 305 car put down like 257 RWHP with a set of milled 062s, the GMPP intake, headers, exhaust, a mild cam and tuning.
Keep in mind the stock 305 injectors are pretty much maxed out at the 170 HP rating of the L03 at stock fuel pressure. He is going to need to bump up to some 350 injectors at about 14-15 psi to feed the engine. That will require prom tuning. The Vortec is also going to want more timing advance than the L03 ever thought about at both part throttle and WOT.
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Re: Which LO5 do I use?
double check the stack up including the adapter to make sure you will have hood clearance.other than that,the intake should work well.
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Car: 1989 Chevy Camaro RS
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How should i do that? Now heres my next questions, I couldnt build an engine on my own, however im pretty savy with basic jobs ie brakes, starters, stuff like that. Could I replace this motor myself with a stand and hoist? Im trying to save labor costs. This might even enable me to throw a nasty cam in her.
Last edited by RS-Chevy-SS; 02-07-2014 at 01:34 PM.
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Re: Which LO5 do I use?
How should i do that? Now heres my next questions, I couldnt build an engine on my own, however im pretty savy with basic jobs ie brakes, starters, stuff like that. Could I replace this motor myself with a stand and hoist? Im trying to save labor costs. This might even enable me to throw a nasty cam in her.
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Add the diminsions of the intake + the thickness of the adapter & compare it to your current setup & however much you clearance you currently have.Yes,you can use a stand & hoist to do the swap.A nasty cam will require quite a few mods & tuning.The TBI/speed density is very picky to cam changes.You can upgrade the cam,but,there are limits as to how much cam you can reasonably tune & provide air & fuel for.
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Re: Which LO5 do I use?
Yeah,if your mechanically inclined,you should be able to do it.It would be better to have someone with experience to help you out.The LT1 cam would work.The 96 LT4 production cam(Not the LT4 Hotcam) would also make a good upgrade as would the Ramjet marine cam,#14097395)The Ramjet cam is listed new on Ebay quite often for $120.Those are just a few that would make mild upgrades w/o requiring a lot of additional work & mods to support.
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Re: Which LO5 do I use?
You may need to call Summit to get the diminsions on the intake hgt.I don't see them listed.
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Yeah,if your mechanically inclined,you should be able to do it.It would be better to have someone with experience to help you out.The LT1 cam would work.The 96 LT4 production cam(Not the LT4 Hotcam) would also make a good upgrade as would the Ramjet marine cam,#14097395)The Ramjet cam is listed new on Ebay quite often for $120.Those are just a few that would make mild upgrades w/o requiring a lot of additional work & mods to support.
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Re: Which LO5 do I use?
Any of the cams listed above would be relatively easy to tune & wouldn't require any head work,however,as crappy as the stock springs are,I'd wanna change them.The LT1 cam prolly wouldn't be worth the effort to put in becuz it's specs are very close to the stock Vortec cam.The Ramjet cam does produce some awesome torque from 1800 rpm all the way to 5000.In a 305,it even has the slight hint of a lope @ idle.The stock cam is not a bad cam tho & if you change cams,you'll blow your warranty out the door.Also,I wouldn't attempt a cam change as long as your still running stock exhaust.You need a good exhaust system for the cam to work.For the exhaust bolts,saturate them with PB Blaster several times a few hrs before removal & tap on them several times before attempting to break them loose.You should use new bolts for the install,so,if they pop,no big deal unless you are using the old heads for something.IDK how much clearance you have for the bellhsg bolts.Have an assortment of extensions & swivels onhand when you start,or,consider pulling the trans out with it.By the way,I noticed that you can get the TBI adapter plate in both,spreadbore,or,square bore if needed.From the best I can tell,they are approx 1/4" thick.
#88
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Car: 1989 Chevy Camaro RS
Engine: L30 TBI 5.0L Vortec
Transmission: 700R4
Axle/Gears: Stock
Re: Which LO5 do I use?
Any of the cams listed above would be relatively easy to tune & wouldn't require any head work,however,as crappy as the stock springs are,I'd wanna change them.The LT1 cam prolly wouldn't be worth the effort to put in becuz it's specs are very close to the stock Vortec cam.The Ramjet cam does produce some awesome torque from 1800 rpm all the way to 5000.In a 305,it even has the slight hint of a lope @ idle.The stock cam is not a bad cam tho & if you change cams,you'll blow your warranty out the door.Also,I wouldn't attempt a cam change as long as your still running stock exhaust.You need a good exhaust system for the cam to work.For the exhaust bolts,saturate them with PB Blaster several times a few hrs before removal & tap on them several times before attempting to break them loose.You should use new bolts for the install,so,if they pop,no big deal unless you are using the old heads for something.IDK how much clearance you have for the bellhsg bolts.Have an assortment of extensions & swivels onhand when you start,or,consider pulling the trans out with it.By the way,I noticed that you can get the TBI adapter plate in both,spreadbore,or,square bore if needed.From the best I can tell,they are approx 1/4" thick.
#89
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Car: 97 Z71 Extended Cab
Engine: 5.7 Vortec
Transmission: 4L60E
Axle/Gears: 3:42
Re: Which LO5 do I use?
Correct,you will need a squarebore for that intake.That was just an FYI,in case you saw something else.If you do all your research & have the tools needed,you can prolly do the swap over a wkend,if,you don't run into anything.Havin someone with experience & a good manual are always a good idea.You will need an extra set of hands @ times & a couple of good floor jacks.Have a good clean area to work in.Install as much as possible on the engine out of the car as long as it won't interfere with gettin it in & everything lined up.Mark & tag every wire,plug,connector,etc & keep up with all bolts,nuts so they go back in their proper place.I use an assortment of coffee cans & ziplock bags to label & put stuff in.Put waterpump bolts in 1 bag & label it'so on & so on.You be surprised @ how quik you forget where or how somethin went.
Last edited by jokerZ71; 02-07-2014 at 05:29 PM.
#90
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Car: 97 Z71 Extended Cab
Engine: 5.7 Vortec
Transmission: 4L60E
Axle/Gears: 3:42
Re: Which LO5 do I use?
Fast,what do you think about that Summit intake w/ the TBI adapter?Other than possible hgt issues,do you see any problem?
#91
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Car: 1989 Chevy Camaro RS
Engine: L30 TBI 5.0L Vortec
Transmission: 700R4
Axle/Gears: Stock
So im looking at water pumps for it rifht now and i notice it is not the same as the lo3 pump. The l30 pump has to additional lines next to the puller and the lo3 doesn't. Can i just use a lo3 pump on it?
#92
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Car: 97 Z71 Extended Cab
Engine: 5.7 Vortec
Transmission: 4L60E
Axle/Gears: 3:42
Re: Which LO5 do I use?
Yes,you need to use the L03 pump.95 & older blocks have an internal bypass.The L30/L31 have an external bypass plumbed from the intake to the W/P.That is the extra port you see on the w/p.The L03 should have a place(a knockout) that you can install a nipple so that you route the bypass to it.Some ppl just block the intake port & drill 2 to 4 1/8" holes in the thermostat.I don't particularly for that method,but,it does work.The L30/L31 w/p has a different pulley setup than the L03/L05.You would have to swap pulleys & fan if you used the L30/L31 w/p.
#93
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Car: 1989 Chevy Camaro RS
Engine: L30 TBI 5.0L Vortec
Transmission: 700R4
Axle/Gears: Stock
Re: Which LO5 do I use?
Yes,you need to use the L03 pump.95 & older blocks have an internal bypass.The L30/L31 have an external bypass plumbed from the intake to the W/P.That is the extra port you see on the w/p.The L03 should have a place(a knockout) that you can install a nipple so that you route the bypass to it.Some ppl just block the intake port & drill 2 to 4 1/8" holes in the thermostat.I don't particularly for that method,but,it does work.The L30/L31 w/p has a different pulley setup than the L03/L05.You would have to swap pulleys & fan if you used the L30/L31 w/p.
#94
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Car: 91 Camaro RS
Engine: 355 Vortec
Transmission: 700r4
Axle/Gears: 3.42
Re: Which LO5 do I use?
#95
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Car: 1989 Chevy Camaro RS
Engine: L30 TBI 5.0L Vortec
Transmission: 700R4
Axle/Gears: Stock
Re: Which LO5 do I use?
Noob question but what is the bypass for? Could I run without the holes?
#96
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Car: 91 Camaro RS
Engine: 355 Vortec
Transmission: 700r4
Axle/Gears: 3.42
Re: Which LO5 do I use?
Gen I Small blocks 1996 and later (Vortecs) do not have the coolant bypass in the block. The Vortec engines used a special thermostat which actually controlled the bypass port located in the manifold. It would close the bypass when the thermostat was open to force all of the coolant through the radiator.
Therefore when using a 1996 or later block (if it does not have a bypass port in the block) you need to provide an external bypass of some sort. Otherwise when the thermostat is closed there is no coolant circulation through the engine. This will cause hot spots in the engine and since the thermostat is not located at one of the hot spots it will probably not open. Many times you will not even see much of a rise on the temp gauge either and unless you here the coolant boiling in your heads you will probably have no idea why your shiney new motor cooked.
#97
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Car: 1989 Chevy Camaro RS
Engine: L30 TBI 5.0L Vortec
Transmission: 700R4
Axle/Gears: Stock
The L03 pump should work fine.
Gen I Small blocks 1996 and later (Vortecs) do not have the coolant bypass in the block. The Vortec engines used a special thermostat which actually controlled the bypass port located in the manifold. It would close the bypass when the thermostat was open to force all of the coolant through the radiator.
Therefore when using a 1996 or later block (if it does not have a bypass port in the block) you need to provide an external bypass of some sort. Otherwise when the thermostat is closed there is no coolant circulation through the engine. This will cause hot spots in the engine and since the thermostat is not located at one of the hot spots it will probably not open. Many times you will not even see much of a rise on the temp gauge either and unless you here the coolant boiling in your heads you will probably have no idea why your shiney new motor cooked.
#98
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Car: 97 Z71 Extended Cab
Engine: 5.7 Vortec
Transmission: 4L60E
Axle/Gears: 3:42
Re: Which LO5 do I use?
Some L03 pumps have a knockout for the extra port,some don't.I've seen the w/ a knockout the needs to be threaded & I've seen them w/ the port already threaded w/ a plug installed.I guess it depends on the brand pump,or,maybe the application.The intake will have the by-pass port.You need to plumb from this intake port to the w/p,or'drill the holes in the thermostat.Either will work fine.
#99
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Car: 1989 Chevy Camaro RS
Engine: L30 TBI 5.0L Vortec
Transmission: 700R4
Axle/Gears: Stock
Re: Which LO5 do I use?
Some L03 pumps have a knockout for the extra port,some don't.I've seen the w/ a knockout the needs to be threaded & I've seen them w/ the port already threaded w/ a plug installed.I guess it depends on the brand pump,or,maybe the application.The intake will have the by-pass port.You need to plumb from this intake port to the w/p,or'drill the holes in the thermostat.Either will work fine.
I also think that I will be switching to the GMPP vortec TBI intake. Seems like it will require less to make it run right. By the time I factor in adapter cost, the difference is only about 100 or so. Will that intake have the required ports for the bypass
Last edited by RS-Chevy-SS; 02-08-2014 at 08:59 AM.
#100
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Car: 97 Z71 Extended Cab
Engine: 5.7 Vortec
Transmission: 4L60E
Axle/Gears: 3:42
Re: Which LO5 do I use?
1 port is the bypass.The other port is heater hose.Some apps have the heater hose routing the passenger side radiator tank,so,the w/p port wasn't used.You can't use that Vortec pump unless you change pully & fans.Under that red cap is a threaded hub.The Vortec pully assembly screws onto the w/p whareas the L03 attatches with bolts.Look @ the Vortec/TBI intake @ Pace Performance website.It gives all the info for bypass & EGR routing.I tried to post a link,but,can't seem to for some reason.