Vortec..what do you guys think?
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Car: 91 Z28 Vert
Engine: 305
Transmission: TKO
Axle/Gears: 3.55 10-bolt
Vortec..what do you guys think?
Guys...i have the chance to get my hands on some Vortec heads which I would be interested in putting them onto my L03. I am intersted to see what sort of 1/4 mile and HP numbers I would see out the following combo.
Stock L03 with the exception of a L98 cam, headers, exhaust, Intake (well would have to be a new vortec intake if the vortec's went on), 355 (I think) posi rear, stock 700R4 and stock converter.
What do you guys think???
Dave
Stock L03 with the exception of a L98 cam, headers, exhaust, Intake (well would have to be a new vortec intake if the vortec's went on), 355 (I think) posi rear, stock 700R4 and stock converter.
What do you guys think???
Dave
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Car: 1999 Yamaha Banshee
Engine: 379cc twin cyl 2-stroke stroker
Transmission: 6 spd manual
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I'd grab em up...
They're good heads...
keep in mind you are going to have to do some tuning.....
They're good heads...
keep in mind you are going to have to do some tuning.....
#3
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Car: yy wife, crazy.
Engine: 350, Vortecs, 650DP
Transmission: TH-350
Axle/Gears: 8.5", 3.42
Make sure you're ready to spend money on extras.
You'll need a chip to bypass EGR, or hardware to make factory EGR work.
You'll see a drop in compression from the larger combustion chambers (64 over 58). You may be able to overcome this by using a thinner head gasket, but the matting surfaces have to be completely flat.
I'd upgrade the factory springs also. The L98 cam is OK for the lift, but those factory springs are just plain WEAK!!! Plus there's no spring damper in them. Both things that hurt upper RPM power.
Other than that it should work rather well.
You'll need a chip to bypass EGR, or hardware to make factory EGR work.
You'll see a drop in compression from the larger combustion chambers (64 over 58). You may be able to overcome this by using a thinner head gasket, but the matting surfaces have to be completely flat.
I'd upgrade the factory springs also. The L98 cam is OK for the lift, but those factory springs are just plain WEAK!!! Plus there's no spring damper in them. Both things that hurt upper RPM power.
Other than that it should work rather well.
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Car: 91 Z28 Vert
Engine: 305
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Axle/Gears: 3.55 10-bolt
Thanks guys....its even better that these things are FREE!!! ya needless to say I have a great buddy.
As for the tuning etc...I already have to do that after my L98 cam swap so that was something I was going to do in the spring anyways....
.....extras....what sort of extras other than the better springs???? and what do you guys think these extras will run me.
Also should I get much work done on them before putting them on...ie porting etc????
Thanks,
Dave
As for the tuning etc...I already have to do that after my L98 cam swap so that was something I was going to do in the spring anyways....
.....extras....what sort of extras other than the better springs???? and what do you guys think these extras will run me.
Also should I get much work done on them before putting them on...ie porting etc????
Thanks,
Dave
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Car: '90 RS
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Do you plan on using these for a 350 down the road. If you do I would save them for now. If however you want them for your 305 because you are keepong it I would have the heads milled to achieve the correct chamber size as well as having the spring seats machined to accept a larger cam down the road. there are a variety of high performace springs that are really cheap that you can use. I would focus on what you want these heads to go on perminately. ERG will be a major factor to consider as mentioned above. My buddy runs these on his 305 with machined seats, milled .020 (I think) with a thinner head gasket and EGR delet in his chip. They are great heads and he can always put a cam larger than the LT1 that he is running now.
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Car: 1991 RS
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Get on that chit!
Go for that right now!
I usually use the Comp Cams springs #981-16 to replace the stock Vortec springs.
While there are alternatives available, I went with the GM Performance Parts TBI-Vortec Manifold. This allowed me to pipe in exhaust for EGR to retain emmisions compliance.
The increased flow of these heads will go along way, particulary with the headers and cam.
Some datalogging and tuning and you'll notice a huge difference.
Best of luck-
S-D
I usually use the Comp Cams springs #981-16 to replace the stock Vortec springs.
While there are alternatives available, I went with the GM Performance Parts TBI-Vortec Manifold. This allowed me to pipe in exhaust for EGR to retain emmisions compliance.
The increased flow of these heads will go along way, particulary with the headers and cam.
Some datalogging and tuning and you'll notice a huge difference.
Best of luck-
S-D
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Car: yy wife, crazy.
Engine: 350, Vortecs, 650DP
Transmission: TH-350
Axle/Gears: 8.5", 3.42
Re: Get on that chit!
Originally posted by swerve-driver
Go for that right now!
I usually use the Comp Cams springs #981-16 to replace the stock Vortec springs.
Go for that right now!
I usually use the Comp Cams springs #981-16 to replace the stock Vortec springs.
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#8
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Car: 91 Z28 Vert
Engine: 305
Transmission: TKO
Axle/Gears: 3.55 10-bolt
ShiftyCapone---> you are right on the money regarding the 305 / 350 debate. I was hoping that I could toss them on my 305 for now and then down the road when i do build a 350/383 toss them on there. But that is probably going to be like 2/3 years before I actually get around to doing up an engine at the rate that I work....lol....
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Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Originally posted by tanager11
ShiftyCapone---> you are right on the money regarding the 305 / 350 debate. I was hoping that I could toss them on my 305 for now and then down the road when i do build a 350/383 toss them on there. But that is probably going to be like 2/3 years before I actually get around to doing up an engine at the rate that I work....lol....
ShiftyCapone---> you are right on the money regarding the 305 / 350 debate. I was hoping that I could toss them on my 305 for now and then down the road when i do build a 350/383 toss them on there. But that is probably going to be like 2/3 years before I actually get around to doing up an engine at the rate that I work....lol....
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Re: Re: Get on that chit!
Originally posted by AJ_92RS
You pulled the damper out, or did you have the guide bosses cut down?
You pulled the damper out, or did you have the guide bosses cut down?
Thanks,
S-D
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dave, better get a move on, I dyno'd at 178 HP last dyno day
and I still have stock cast log manifolds, stock intake, cam and heads to go
I'm gunning for 200 HP with still stock cam, intake, heads.
Oh yeah, I still gotta drop off those axles at your house, may pass by today, gonna be around, can chit chat about who's car is more purple lol
and I still have stock cast log manifolds, stock intake, cam and heads to go
I'm gunning for 200 HP with still stock cam, intake, heads.
Oh yeah, I still gotta drop off those axles at your house, may pass by today, gonna be around, can chit chat about who's car is more purple lol
#12
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Car: '90 RS
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Originally posted by Slade1
dave, better get a move on, I dyno'd at 178 HP last dyno day
and I still have stock cast log manifolds, stock intake, cam and heads to go
I'm gunning for 200 HP with still stock cam, intake, heads.
Oh yeah, I still gotta drop off those axles at your house, may pass by today, gonna be around, can chit chat about who's car is more purple lol
dave, better get a move on, I dyno'd at 178 HP last dyno day
and I still have stock cast log manifolds, stock intake, cam and heads to go
I'm gunning for 200 HP with still stock cam, intake, heads.
Oh yeah, I still gotta drop off those axles at your house, may pass by today, gonna be around, can chit chat about who's car is more purple lol
#13
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Car: 91 Z28 Vert
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rovic......geez.....long time no see/talk.....how are things man????
Ha ha.....ya sort of made up my mind last night I am just going to grab them and hold on to them until I build-up by 350/383.....its a much better long term strategy etc....
Ya Rovic....I should be sort of "in and out" this weekend if you know what I mean....drop by if you are in the area and If I am home we will chit/chat and if not just toss them on my driveway by the garage...
Thanks.....good to hear from ya again!
Ha ha.....ya sort of made up my mind last night I am just going to grab them and hold on to them until I build-up by 350/383.....its a much better long term strategy etc....
Ya Rovic....I should be sort of "in and out" this weekend if you know what I mean....drop by if you are in the area and If I am home we will chit/chat and if not just toss them on my driveway by the garage...
Thanks.....good to hear from ya again!
#14
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Re: Get on that chit!
Originally posted by swerve-driver
Go for that right now!
I usually use the Comp Cams springs #981-16 to replace the stock Vortec springs.
While there are alternatives available, I went with the GM Performance Parts TBI-Vortec Manifold. This allowed me to pipe in exhaust for EGR to retain emmisions compliance.
The increased flow of these heads will go along way, particulary with the headers and cam.
Some datalogging and tuning and you'll notice a huge difference.
Best of luck-
S-D
Go for that right now!
I usually use the Comp Cams springs #981-16 to replace the stock Vortec springs.
While there are alternatives available, I went with the GM Performance Parts TBI-Vortec Manifold. This allowed me to pipe in exhaust for EGR to retain emmisions compliance.
The increased flow of these heads will go along way, particulary with the headers and cam.
Some datalogging and tuning and you'll notice a huge difference.
Best of luck-
S-D
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Re: Re: Get on that chit!
Originally posted by seanof30306
how did you pipe in the exhaust for the egr?
how did you pipe in the exhaust for the egr?
I bought the ss braided out of a McMaster Carr catalog (about $30). The rest of the fittings came from the hardware store.
System works fine. I get no SES lights or anything.
S-D
#16
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Re: Re: Re: Get on that chit!
Originally posted by swerve-driver
Like this-
I bought the ss braided out of a McMaster Carr catalog (about $30). The rest of the fittings came from the hardware store.
System works fine. I get no SES lights or anything.
S-D
Like this-
I bought the ss braided out of a McMaster Carr catalog (about $30). The rest of the fittings came from the hardware store.
System works fine. I get no SES lights or anything.
S-D
i'm in the process of installing dual cats ... wonder if i could split the passenger side A.I.R. to both cats and get enough exhaust gas?
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Re: Re: Re: Re: Get on that chit!
Originally posted by seanof30306
so, you're taking the A.I.R. from the driver's side and using it for the egr, and using the passenger side A.I.R. for the cat?
i'm in the process of installing dual cats ... wonder if i could split the passenger side A.I.R. to both cats and get enough exhaust gas?
so, you're taking the A.I.R. from the driver's side and using it for the egr, and using the passenger side A.I.R. for the cat?
i'm in the process of installing dual cats ... wonder if i could split the passenger side A.I.R. to both cats and get enough exhaust gas?
I do not know if the AIR pump would supply enough AIR for two cats.
I wonder if cars that came stock with 2 cats had a higher volume AIR pump.
Anyone?
S-D
#18
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Re: Re: Re: Re: Re: Get on that chit!
Originally posted by swerve-driver
My original 305 had AIR into both exhaust manifolds and the cat. The new setup takes exhaust from the Drivers Side and puts it into the EGR. The AIR pump still feeds into the Passenger side exhaust header and into the cat.
I do not know if the AIR pump would supply enough AIR for two cats.
I wonder if cars that came stock with 2 cats had a higher volume AIR pump.
Anyone?
S-D
My original 305 had AIR into both exhaust manifolds and the cat. The new setup takes exhaust from the Drivers Side and puts it into the EGR. The AIR pump still feeds into the Passenger side exhaust header and into the cat.
I do not know if the AIR pump would supply enough AIR for two cats.
I wonder if cars that came stock with 2 cats had a higher volume AIR pump.
Anyone?
S-D
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Car: 1991 RS
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The intake has an EGR port cast into it. The exhaust gas goes intot he drivers side front, the EGR valve is on the Passenger side front. The exhaust then routes through the intake to just under the TBI. I only have a picutre of the EGR valve location.
Thanks,
S-D
Thanks,
S-D
#21
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Originally posted by swerve-driver
The intake has an EGR port cast into it. The exhaust gas goes intot he drivers side front, the EGR valve is on the Passenger side front. The exhaust then routes through the intake to just under the TBI. I only have a picutre of the EGR valve location.
Thanks,
S-D
The intake has an EGR port cast into it. The exhaust gas goes intot he drivers side front, the EGR valve is on the Passenger side front. The exhaust then routes through the intake to just under the TBI. I only have a picutre of the EGR valve location.
Thanks,
S-D
#22
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Car: 1991 RS
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Originally posted by seanof30306
what intake are you using?
what intake are you using?
SD
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