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#20
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I've got a couple points to make on this whole 1970 L/89 topic.
First of all, the only production aluminum head in 1970 was the '074 ( ZL-1 & L-88 ). This head used a voluminous combustion chamber in conjunction with the 427 ZL-1 & L-88 pistons. There would have been a total combustion chamber mis-match as no 396 ( or 402 ) pistons existed from GM in the 12:1 realm. So how do we account for this? If you put a set of '074 heads on a 396 ( 11:1 ) back then, it probably would have run like a dog. The 396 probably couldn't pull enough air to take advantage of this head design. Secondly, I thought there were no L/89 options in 1970. Steve
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