advice and combinations
Joined: Jan 2005
Posts: 10,404
Likes: 492
From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: advice and combinations
I am hoping for some fast advice on the motor i am building for my 94 suburban..i gave up on the vortec engine idea and have a virgin 3638 marine block with 810 heads with the big valves...i have done countless searches on cam and intakes combo's but i am pretty much staying stock and shooting for fuel mileage. i am putting an edlebrock performer RPM intake with a transdapt plate on and some 1.5 roller tip rockers i have..its a roller block but it has a flat tappet cam..my question is 1. should i stay with the cam thats in it ? 2. if i can find a factory roller cam out of another 350 tbi motor would it be of any benifit? 3. i have access to a vortec cam/lifters etc to put in my motor.. i am looking for torque to move this heavy thing around...i have noway of doing any tuning on it and wont be able to for sometime to come i am sure..i just need to get this wrapped up..
The 4 center bolt holes on the Performer RPM will need to be elongated to fit the 87+ intake bolt pattern drilled into the heads.
Thread Starter
Junior Member
Joined: Nov 2005
Posts: 84
Likes: 0
From: TEXAS
Car: 1991 Camaro RS
Engine: stock 305
Transmission: T-5
Axle/Gears: 4th gen with 342's
Re: advice and combinations
so the vortec cam and my computer should get along fairly well? i have machined the holes on the intake for the heads already.. my main concern is keeping the computer happy...thanks fast355
Thread Starter
Junior Member
Joined: Nov 2005
Posts: 84
Likes: 0
From: TEXAS
Car: 1991 Camaro RS
Engine: stock 305
Transmission: T-5
Axle/Gears: 4th gen with 342's
Re: advice and combinations
Fast...or anyone who can help...i have the vortec cam ready to go...i did notice that the push rods from the vortec motor are about 1 1/2 inches shorter than the ones from the motor i am building...i am not sure which ones to use...i am thinking prob the longer ones because the vortec heads are so much different than the 810's i am running...i would be very thankful for your help...
Joined: Jan 2005
Posts: 10,404
Likes: 492
From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: advice and combinations
Fast...or anyone who can help...i have the vortec cam ready to go...i did notice that the push rods from the vortec motor are about 1 1/2 inches shorter than the ones from the motor i am building...i am not sure which ones to use...i am thinking prob the longer ones because the vortec heads are so much different than the 810's i am running...i would be very thankful for your help...
I also missed the question.
I ran the even hotter F-car LT1 cam on the stock tuning and the computer ran without any hicups. Both cams have a very high, steady vacuum signal that keeps the ECM happy.
Thread Starter
Junior Member
Joined: Nov 2005
Posts: 84
Likes: 0
From: TEXAS
Car: 1991 Camaro RS
Engine: stock 305
Transmission: T-5
Axle/Gears: 4th gen with 342's
Re: advice and combinations
thanks Fast you have been a great help...i was wondering if you had any idea how much more torque/hp does it add going from the stock combo i had to using the vortec cam roller stuff and a performer rpm intake with adapter ? and beside tuning and headers do you have anyother advice or suggestions?
Member
Joined: Feb 2009
Posts: 119
Likes: 0
From: Delta, BC
Car: '91 S10 Blazer
Engine: TBI 350
Transmission: 700R4
Axle/Gears: 3.73 posi
Re: advice and combinations
A note on the pushrods....
The Vortec heads you'll notice don't use guide plates (they have the 'special' rockers), so the pushrods are not hardened.
If you elect to get guide plates added and go with normal rockers, you have to make sure you use the proper (hardened) pushrods.
The Vortec heads you'll notice don't use guide plates (they have the 'special' rockers), so the pushrods are not hardened.
If you elect to get guide plates added and go with normal rockers, you have to make sure you use the proper (hardened) pushrods.
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Thread Starter
Junior Member
Joined: Nov 2005
Posts: 84
Likes: 0
From: TEXAS
Car: 1991 Camaro RS
Engine: stock 305
Transmission: T-5
Axle/Gears: 4th gen with 342's
Re: advice and combinations
By "special rockers" are u refering to self aligning rockers? cuz i am thinking most the later model stuff has them...anyways i am running self aligning 1:5 vortec roller tip rockers..after Fast's advice i got to thinking and if i am correct the roller lifter is probably about 1 1/2 inches longer than the standard flat lifter...so thats where the difference in how long they are come from.. i know this is for camaro stuff and the motor that i am pulling from my burban will end up in the camaro...but right now i am determined to get around 25mpg outta the burban...under the right conditions..
Member
Joined: Feb 2009
Posts: 119
Likes: 0
From: Delta, BC
Car: '91 S10 Blazer
Engine: TBI 350
Transmission: 700R4
Axle/Gears: 3.73 posi
Re: advice and combinations
Yes, the self aligning ones.
I just thought I'd mention the pushrods in case you had plans to do things to the heads (like adding guide plates - which would then trash your pushrods), or someone else stumbled on this thread and was wondering.
I just thought I'd mention the pushrods in case you had plans to do things to the heads (like adding guide plates - which would then trash your pushrods), or someone else stumbled on this thread and was wondering.
Junior Member
Joined: Mar 2009
Posts: 52
Likes: 0
From: Michigan
Car: 1989 Iroc-Z Camaro: Sold :(
Engine: 305 TPI
Transmission: Built 700r4
Axle/Gears: 3.27
Re: advice and combinations
I would like to know what is the best Cold Air Intake I can buy for And 89 305 TPI Camaro? And what is the best Super chip/ Performance Chip I can but for it?
Member
Joined: Feb 2009
Posts: 119
Likes: 0
From: Delta, BC
Car: '91 S10 Blazer
Engine: TBI 350
Transmission: 700R4
Axle/Gears: 3.73 posi
Re: advice and combinations
They're cheap, and easy to find, right under the button marked "new thread".
Junior Member
iTrader: (1)
Joined: Mar 2008
Posts: 77
Likes: 0
From: Victoria, Tx
Car: 1992 Camaro RS Convertible
Engine: L03
Transmission: 700R4
Axle/Gears: LS1 posi/disk 3.42
Re: advice and combinations
"I ran the even hotter F-car LT1 cam on the stock tuning and the computer ran without any hicups. Both cams have a very high, steady vacuum signal that keeps the ECM happy."
Wait i thought tuning WAS needed when using any LT1 cam?
Wait i thought tuning WAS needed when using any LT1 cam?
Last edited by vorticaldavid; Apr 6, 2009 at 08:51 PM.
Joined: Jan 2005
Posts: 10,404
Likes: 492
From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: advice and combinations
Not running in a TBI truck 350 it isn't. I adjusted the regulator to 14 psi running the stock AWLD chip in the 299 ECM. It ran GREAT.
The stock hydraulic flat tappet cam in a truck is 194/203 @ .050, .390/.410" lift, 112* LSA. The stock LT1 is 203/205 @ .050, .447/.459, 115* LSA. The Vortec cam is 191/196 @ .050, .414/.428, 111* LSA.
In a 305 F-car tuning IS needed. The factory 305 cam is 179/194 @ .050, .350/.385" lift, 109*LSA and it has fewer cubes.
Last edited by Fast355; Apr 6, 2009 at 09:25 PM.
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