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So with that being said, The 10.1-1 compression that was advertised in 69 & 70 on the 383,440's with the 906 heads really wasn't true? More like 9.5-1. Would this be a true fact?



I can't say for 70 because the piston CH changed but the 68-69 383 HP is about 9.2 as delivered , piston is .0025 in the hole , head is 90 - 92 CC, yes Chrysler OVER RATED compression ratios on the 383 and I am sure others