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Thread: 305 heads with 1.94 valves on a semi stock 350?

  1. #1

    305 heads with 1.94 valves on a semi stock 350?

    i bought this amazing 84 gmc pickup for $100. www.cardomain.com. it had a worn out 305 in it, and i am in the middle of an engine swap for a 350. i have bought 2 sets of 350 heads and neither one was what they were supposed to be. i have a set of 1.94 valve 305 heads with open chambers, and i was wondering if this would surfice until i had the money to buy a good set of 350 heads? the specs of the engine are: stock crank turned .10 on main and rod.. 495 lift comp cam with 295 duration intake/exhaust. new lifters and springs to match cam. new stock bore summit pistons with new rings. and a built quadrajet 4 barrel. this is just for the street. will this work for time being? and what kind of power should i expect in the meantime?

  2. #2
    Senior Member MASTER BUILDER
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    Jan 2007
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    Batesville Ms.
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    heads

    You will be pleased as you are not racing, you are trying to move 4500 lbs and this valve will help increase moving power. Later J.Smith 4621 racing

  3. #3
    Member MASTER JOURNEYMAN
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    Nov 2007
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    good luck i had probs with detonation others have had better luck,with such a small comb chamber 50-58cc? it raises compression almost too much for stock parts ,plenty of 882 castings w/194 out there and used aftermarket heads arent hard to find.

  4. #4
    Senior Member RACING JUNKIE
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    Sep 2007
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    4,143
    Quote Originally Posted by twobad1
    good luck i had probs with detonation others have had better luck,with such a small comb chamber 50-58cc? it raises compression almost too much for stock parts ,plenty of 882 castings w/194 out there and used aftermarket heads arent hard to find.
    That's what I thought too( the small chambers) I almost answered the post yesterday but I wasn't possitive/..He said open chambered heads and all the 305's I've seen had 58 cc chambers or something like that.

  5. #5
    Member MASTER JOURNEYMAN
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    Nov 2007
    Location
    annapolis md
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    like JS said he may be ok on street.w/low timing & the right cam it could make a respectable 300plus hp,Q-jet!? if thats all the budget allows go for it! just keep it cool!! thats what killed mine

  6. #6
    The Chevy performance page has a HP buildup on a very similar setup to your engine. With stock Chev heads no less.

    http://www.chevyhiperformance.com/te...ild/index.html


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