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dwd70gto

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Hi guys,
I have a 1970 gto. The car has a 1969 400 engine with 1977 6x-8 heads.
Does this mean I can run 87 unleaded gas .
 
Welcome aboard! And thank you for signing up. I think I should leave the answer to this question to more experienced people. Somebody will surely respond shortly...
 
the original 69 heads measured about 72cc, the 6x-8 from 77 is about 100cc, so as long as you dont hear any ignition ping the 87 octane should be fine.
 
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