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Re: rebuilding an old school 383 conversion...
With a 64cc chamber, You need to determine if the block has been decked (is the stamping still on the ID pad in front of #2 cylinder?)
IF it's been zero decked you will want a piston with a 22cc dish.
If it's a near stock 9.025" deck you want a 12cc "D" dish. (much preferred)
With those heads and a 0.041 gasket, and flat top piston with 3-5cc eyebrow valve reliefs your looking at ~10.5:1,, if it's been zero decked yor over 11:1.
Yes aluminum heads will tolerate a little more compression than it's iron counterpart. But in a mild cam cruising application I still like to stick around 9.6:1 even with aluminum heads.
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Still playin with trucks, even at my age!
When you're dead, it's only a problem for the people around you, because you don't know you're dead.
.....It's kinda the same when your STUPID.
I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral.
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