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Old May 16th, 2009, 12:38 PM   #13
deathbypsi
Brian R.
 
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If that motor has a stock bottom end with a replacement 30 over piston and the GT40p heads there is no way it has more than 9.3-1 compression unless somebody milled a ton off those heads.And by a ton I mean so much that the intake would have fitment issues.

Stock 5.0 pistons have about a 12 or 16cc dish and the heads have a 60- 61cc chamber.
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