datsun327 Posted August 23, 2004 Share Posted August 23, 2004 i came across a set of mid 70s corvette heads. with 0 miles on them for 150.00. first wanted to see what i would do for me. block is a 355,hyperutectic pistons, cast rods and crank. cam is 220@ .040 planing on goin with a 650cfm carb and air gap intake. what to know will these heads hurt me more than help Quote Link to comment Share on other sites More sharing options...
Z-TARD Posted August 24, 2004 Share Posted August 24, 2004 Mid 70's might be emmissions heads, which would be a bad thing. No way to know for sure though unless you can give us some casting numbers to look up. There should also be a casting mark at the front of the head, most of the decent heads will have two rounded humps cast here, looks kind of like the McDonalds golden arches. Other heads will have triangle, or rectangular shaped casting marks here, but again, no way to tell for sure without having some casting numbers to go off of. ( Casting numbers will be located in the valve train area) Hope this helps, Mike Quote Link to comment Share on other sites More sharing options...
Guest 73TPIZ Posted August 24, 2004 Share Posted August 24, 2004 When you find out the casting #'s you can check out these websites to see what you got. http://www.kendrick-auto.com/chevrolet_head_casting_number_re.htm http://www.mortec.com/castnum.htm later Quote Link to comment Share on other sites More sharing options...
datsun327 Posted August 25, 2004 Author Share Posted August 25, 2004 the casting number is 3932441 1696-1972 327-350 intake-1.94/exhuast-1.5 hopes this help http://www.73-87.com/chevy_ids/sbheads.htm Quote Link to comment Share on other sites More sharing options...
datsun327 Posted August 27, 2004 Author Share Posted August 27, 2004 +++ Quote Link to comment Share on other sites More sharing options...
datsun327 Posted August 27, 2004 Author Share Posted August 27, 2004 +++ Quote Link to comment Share on other sites More sharing options...
datsun327 Posted August 27, 2004 Author Share Posted August 27, 2004 +++ Quote Link to comment Share on other sites More sharing options...
datsun327 Posted August 30, 2004 Author Share Posted August 30, 2004 3932441 350, 76cc, 161-165cc intake port i used the site that was listed aboved. found this info in the set of heads. with the 76cc chambers how willl that effect my power output? is bigger better in this case? Quote Link to comment Share on other sites More sharing options...
ZROSSA Posted August 30, 2004 Share Posted August 30, 2004 Smaller chamber will be beter for more power, compression, squish and should be less likely to detonate at a set compression ratio. I had a look in Vizards chevy bookd earlyer and this head number wasnt one of the ones he sugested to use. There is a lot of good info on the web, and on your side of the world good after market used iron heads can be picked up for very little. I wouldnt bother with early factory heads in your situation. Douglas Quote Link to comment Share on other sites More sharing options...
Guest Phil1934 Posted August 30, 2004 Share Posted August 30, 2004 One of the drag racing boards mentioned heads by http://www.pbmperformance.com/ as $400 less than Canfield, which are on a par with AFR. Quote Link to comment Share on other sites More sharing options...
Pyro Posted August 31, 2004 Share Posted August 31, 2004 After market heads kick butt. Those old stocker just don't do it anymore. The head will work ok but you will lose 30 or 40 hp! And by the time you install springs, bigger valves, screw in rockers, port work, and a valve job you will have an old set of heads that cost more than a better performing new head. If you want to build a mild 350 then use flat top pistons, 76 cc combustion chambers, 180 to 195cc intake ports, and a 210 to 220 degree cam. 76cc combustion chamber will make 9 to 9.25:1 with a 350 flat top engine. If you want to build a hot 350 then use flat top pistons, 64 cc combustion chambers, 195 to 215cc intake ports, and a 230 to 240 degree cam. 64cc combustion chamber will make 10 to 10.25:1 with a 350 flat top engine. Consider the following heads from summit racing or jegs: dart iron eagle, world products sportsman II, trickflows, AFR, or GM vortec heads. Quote Link to comment Share on other sites More sharing options...
Guest Phil1934 Posted August 31, 2004 Share Posted August 31, 2004 I shoud have mentioned the heads he got from pbm even had a Canfield logo on them. Sort of like those Gen'l Kinetics cam everyone reboxes. You might as well get them from PAW. Quote Link to comment Share on other sites More sharing options...
Sleeper-Z Posted August 31, 2004 Share Posted August 31, 2004 *cough* ported 461's with enlarged valves and complete! for $300 *cough* steven m. Quote Link to comment Share on other sites More sharing options...
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