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Back in the day we ran 12:1 compression on 88 octane pump gas no alky. Couldn't advance timing much past stock or it would detonate at low rpm. Made more hp, and at 3 mpg/ 25¢ a gallon, didn't care about efficiencies
Btdt. Recessing the seats is what pretty much any shop can do as part of the rebuild processes. Lets you shave the head as much as .090"
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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