Thread: Torque

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Originally Posted by co68956

Thanks again guys, this site is alot more helpful then others i have tried...

I do have the pistons, they came with the block, but they are new speed-pro pistons. I have also been searching for the cc of the chamber of those heads with no luck, i might need to give GM a call or find an email address for them. I'm also not sure of the deck height, i purchased the engine with all machine work completed, the guy was going to piece it together and sell it but couldnt find time to complete it.

I will be using a mechanical fuel pump, I found one of the 2 specs you listed for flat tappet on a marine cam, the other i have had no such luck. Will watch that short side with these heads.

I have found a set of re-built heads for fairly cheap. I found a bit more info on them also. 2diff years a '71&'72 valves at 2.06Int./1.72Exh. oval port, open chamber, 113cc chambers... casting #s are 3993820 & 3999241...as i was typing this it occured to me that i read somewhere the older heads would not work with my Gen.V block due to different size water passages...can you confirm this?

Again thanks alot guys, this is alot better than fighting with someone telling me according to his equasion a q-jet will not work, I need 750cfm so i have to get a holley... entertaining, but not at all informing

them heads will not work on the mark 5 or 6 they get very thin by the lifter valley side of the deck and the head gasket will not hold you would have to check this but 99% of the time it is no way .them cams are Howards i use ERSON now but there many cams out there but stay close to them numbers and yes run a roller even the one i listed and use a electric fuel pump. if them are 427 heads i will see i think them are small port heads with both intake and exhaust rotators on the valve springs