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Old 11-30-2010, 08:13 AM
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stock 350 adding vortech heads

Hello,
I want to add vortech heads to my stock 350 wanted to know about camshaft and horsepower combinations. Stock 350 (74 truck block) stock dish pistons. 84 trans am weekend warrior (but want it streetable with good vacuum for power assist and a/c) borg warner t-5 manual trans with 373 rear gear. Reading some of the articles I can run a 460 lift cam without modification of the heads. What kind of ponys could I expect from no head modifications. also how much benefit would it be to modify the heads for a larger camshaft. some of the articles were pulling over 400 horse and about 400 ft lbs of torque. Thanks for listening.

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Old 11-30-2010, 09:25 AM
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Quote:
Originally Posted by merlinsta
Hello,
I want to add vortech heads to my stock 350 wanted to know about camshaft and horsepower combinations. Stock 350 (74 truck block) stock dish pistons. 84 trans am weekend warrior (but want it streetable with good vacuum for power assist and a/c) borg warner t-5 manual trans with 373 rear gear. Reading some of the articles I can run a 460 lift cam without modification of the heads. What kind of ponys could I expect from no head modifications. also how much benefit would it be to modify the heads for a larger camshaft. some of the articles were pulling over 400 horse and about 400 ft lbs of torque. Thanks for listening.
depends who you talk to wether its .460" or .480" or .440". Measure it yourself to make sure. Add like .060" for clearance and go from there.
I did this myself....First time Modifying Vortec Heads for Lift.

When i did it i took off like .120" so its good for way around .600"
heres an article....http://www.chevyhiperformance.com/te...ift/index.html

Last edited by zildjian4life218; 11-30-2010 at 09:34 AM.
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Old 11-30-2010, 10:18 AM
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Look for a .450 lift cam and you should be safe. Use 1.5 self aligning rocker arms. Stock ones are fine, inexpensive and dependable.

Here's a cam that might interest you.

http://www.summitracing.com/parts/ISK-201264/


You'll at least need to upgrade to a high performance spring. I personally used Lunati's 73943, minus the inner dampers. You can also use isky 205-Dd valve springs, again, minus the inner dampers.

You can use a shim head gasket to bring your compression ratio up a little. You're decks will have to be perfectly flat and clean and you also need to be sure the piston is at least .02 down in the hole / below the deck at TDC.

You should make around 400 hp, give or take depending on intake, carb and headers. You'll get best results with a RPM style intake and 1 5/8" full length headers.

There's numerous vortec headed builds listed on this site. Just do a search.
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Old 12-03-2010, 12:24 AM
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My toss, the Comp Magnum 270 cam is the best match with performer intake. The Magnum 270 with kick the XE268 in the pants from 1500-5000. In road cars with 2.2-2.96 rear gear the Performer cam in a 350/TH350 will pull harder through idle-4500.

The 270 Magnum is one of the best cams made. Great dual purpose
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