IIRC the term was "lightly ported stock heads" if that's the case I should have sent my heads that way haha
He was working on some steel ring land billet pistons for the 6.4L at one point.
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Still is
People dont realize you can make decent power on 6.4 heads when you force feed a ton of air through them, they are going to eventually make power, its just not in the efficiency range we would mostly like to see
I know Drew is going to do some very great things, but there have been a LOT of good machinists involved in the 6.4 industry for years, there's just a limitation of platform.
FWIW, they really really do love spray, and anyone who has sprayed a big fuel 6.4 knows it. Mine went from 867 to 1362.. with 2 stages..