Happens under load at WOT, never tried to go part throttle at that speed. Am running Hydraulic lifter's & a high volume oil pump. The heads are not ported but do flow well with 2.11 intake & 1.66 exhaust vales from factory. They are the 6x-4 heads from the w-72 package. The header's are Dynomax ceramic coat with 1 7/8" (I think) primaries
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