View Full Version : 305 heads with 1.94 valves on a semi stock 350?
robbiesmechanic
03-19-2009, 09:12 AM
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?
JimmySmith
03-19-2009, 04:12 PM
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 :D
twobad1
03-20-2009, 07:05 AM
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.
Tod74
03-20-2009, 08:05 AM
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.
twobad1
03-20-2009, 08:59 AM
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
Ontario350
03-21-2009, 04:19 AM
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/techarticles/148_0306_chevrolet_355_engine_build/index.html