Quote:
Originally Posted by 68LAlonghorn
Well, after a lot of reading and learning from you guys I'm leaning towards the Summit racing iron heads https://www.summitracing.com/parts/sum-152123#overview. Although I understand that the Vortec heads would be better, they are not in stock and on top of that I had already purchased a new Edelbrock intake manifold and valve covers for the stock heads, so those won't fit. I think the numbers look good for my stock engine, 165cc intake runner, 72 chamber 2.02/1.60 valves. Only question I have is with the 72cc chamber, what will my compression be? Should I try to look for something closer to 64cc?
Couple additional questions:
Should I replace the rockers, pushrods and lifters while am I there?
Any head gasket suggestions? looking at this one https://www.summitracing.com/parts/f...ckup/year/1968
Thanks again for all the help with this. |
It's doubtful your truck engine came from the factory with large valve 64 cc heads. Those heads were mostly found on higher performance 327s.. The truck engines "traditionally" had lower compression and milder cams than passenger cars.. 9+:1 compression ratio will work just fine on your stock engine.. It's probably higher than "stock" anyway.. 10:1 on iron heads might need higher octane gasoline or less than optimal ignition timing numbers to prevent detonation under load.
I'd leave the lifters alone, but you might pull a few of them and inspect for wear and pitting on the face.. Just be sure to put them back in the same location they came from.. Installing new lifters might cause break-in issues and take out the cam.. I'd replace the rocker arms, pivot balls, pushrods and rocker adjusting nuts..