Heads to use, '75 or '77
#3
http://www.442.com/oldsfaq/ofhed.htm
Couple things there- What are your power expectations and what does "rebuild" mean in this context?
#8 heads have 79cc chambers, with flat top pistons and a lot of machine work you'd just inch inch over 9:1 and still have smog heads.
The parts section in CO is full of people near giving away #5, 6, 7a heads that might be better for your application. Even if this is a mid-low compression budget rebuild every engine likes to breathe better.
Last edited by 1BOSS83; October 16th, 2015 at 06:23 PM. Reason: More info
#4
If you are going with new pistons, #8 heads with flat tops are a no brainer. Just mill the small amount to get 9 to 1, add a 2" or 2.07" intake and reuse the factory 1.625" exhaust valve. The only bad area on #8 heads is the lip under the exhaust valve. Easy to remove, just a pocket port on the bowls, intake to match the larger valve and you will have a head on par with early heads. 3A heads are crack prone, restrictive junk with an awful exhaust port.
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