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  1. MoparMadman

    Compression calculation

    I currently have a mild 440 in my car with 9:1 compression. This number was calculated many years ago when the motor was assembled. What I do recall is the compressed head gasket thickness was .025 and 213 heads that were milled and cc’d to 88cc’s to make the 9:1 compression with the P4529429...
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