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I've not heard of one gasket being better than the other. You pick the thickness that meets your need, to achieve the piston to head clearance you're aiming for. Every engine is a little different, especially if the heads have been cut, case decked, etc. First decide what piston to head clearance you are aiming for, e.g. .040", .050", etc., and then a mockup assembly tells you which thickness base gasket you will need to achieve that.
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