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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.

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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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