AeroFlow=Bare Ford 390-428 170cc Aluminum Cylinder Heads with 72cc Chamber

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*(Pair) 2.06" x 1.36" Intake Port, 1.85" x 1.27" Exhaust Port The Aeroflow Series of Aluminum Cylinder Heads are taking affordable performance street and strip cylinder heads to the next level. These heads utilize ultra-smooth A356-T6 aluminum castings, new as-cast runner and chamber designs produce excellent flow numbers. This combined with a 5-angle competition valve job, diamond-honed bronze guides, hand bowl blending and professional assembly help to outperform some of the best brands in the