Approx Compression?
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Staging Lane
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Join Date: Jun 2005
Location: New Orleans
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I believe 5.3 heads on a LQ4 hits around 10.4:1 with a stock gasket. With a .040 gasket you can get about 10.7:1. I think the 6.0 heads flow better, but maybe with the extra compresssion from the 5.3 heads you could pick up a few horsepower. I'm sure if you search there will be more info on this.