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p400 heads
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  1. 6.5/6.2 High Performance Engine Modifications
    Finished up the work on my P400 heads now all that's left is to finish the coating on the combustion chambers... This data is a direct apples to apples test, P400 before and P400 after, ( stage 3 ), the heads have both bigger valves, valve unshrouding, coated runners, 2 angle valve job. These...
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