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Oh ok, If used on a 6.5 Optimizer does it bring the horsepower up? And what do those run? Thanks
 

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The P400 heads are a different casting than any other head, thicker seats under both valves, etc, I'll post a link where I cut one apart showing some of the differences..


this thread is a stock gm/gep head... Ever wonder just how thick your head is ??

I'll pm you some info as well...
 
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