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Old 03-05-2007, 09:11 PM
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How much power can I expect from stock 305 Vortec heads?

So I got given a set of really low milage Vortec heads by a friend who pulled them off a truck that broke the crankshaft from a dunk in a lake. In my excitment over this "score" which I was assured was pulled off a 350, I ordered and paid for an intake manifold which I cannot return. Turns out, after I got the heads, they are 059 casting 305 heads with 1.88" intake valves and 58cc chambers. The engine they are for is a Goodwrench 350, just a stock replacement type engine that was ordered for a '84 pickup. I don't remember any details about it. Runs good and strong in my 86 Safari, anyway. Has 170-175psi compression, burns zero oil and has about 40psi oil pressure hot at idle and 65 psi at at 3500rpm. It's a good, sound engine. I have a Comp Cams Xtreme 4x4 262H cam and lifters for it, and the intake ordered is a "Power+Plus+ Cyclone" performer knock off. Full length 1 5/8" headers and right now, a Q-Jet, although I have a fresh 3310-3 I can run if needed. Compression ratio aside (from the smaller chambers) what can I expect from these 305 Vortec heads?

Last edited by Lil Big Mec; 03-05-2007 at 09:25 PM.
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Old 03-06-2007, 06:35 AM
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If they are stock replacement TBI type heads, they aren't Vor-Tec heads. They are just swirl-port heads.

tom
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Old 03-06-2007, 07:57 AM
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The 059 305 head are simular but not the same as the L31 350 062 vortec heads.
Not the same, but do have good performance potential.
The combustion chamber is more like the 305 "TPI head" 081.

The ports are simular to the 350 vortec heads. The intake valve is smaller, so the valve bowl is going to be smaller.

They have good performance potential. i recomend you do a home porting job on both the intake and exhaust ports and install larger 1.94" intake valves. At that point they will work very well for you. Much better than the heads you're removing on your good wrench motor. The cr will not be too high with 58cc chambers.
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Old 03-07-2007, 08:50 PM
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The old KB piston catalog says a "stock replacement" piston with -12cc dish (to match the stock Goodwrench piston) will give a 10.3:1 CR with 58cc heads and a .040" quench distance.
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