Quote:
Originally Posted by RustyPile
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..
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Ok great, so it sounds like I'll be ok with the 72cc heads then. I'll follow your advise and replace the parts you mentioned.