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The new hot rod magazine shows a new set of heads for the 4.6l they flow so much better than even there ported PI heads. I think they said 453 hp from the same engine by switching to the new style heads and cam. I think trick flow made them.
Cant wait to see someone bolt these puppies to a 5.4l truck engine and see what kind of numbers it can pull bellow 5200 rpm.
I know the heads in the new mag are designed to address the severe flow issue with the stock 2v heads.
2012 F-150 SCREW 3.5TT FX4 3.73
2011 Mustang GT Premium Auto 5.0
2010 Taurus SEL
1999 F-150 SCAB 5.4l Lots of Mods
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