Proflow Cylinder Heads, AirMax 170, Big Block Ford FE ,390-428, Aluminium, Bare,

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Proflow Cylinder Heads, AirMax 170, Big Block Ford FE ,390-428 Proflow does not sacrifice quality for a low price--you get both with our aluminium cylinder heads. The lightweight heads are cast from A-356 aluminium alloy with a large choice of engine, for SB & BB Chevrolet, LS Chev Holden Ford SB 289-351W, 302, 351 Cleveland 2V & 3V & BB FE, and Chrysler SB & BB. They have phosphorous bronze valve guides, and ductile iron valve seats for use with unleaded gas. They're also end-milled and drilled for accessories. The fully assembled heads have stainless steel valves, high performance valve springs, 7 degree valve locks, rocker arm studs, and guideplates. Perfect for your Mild or High performance Hot Rod. Combustion Chamber Volume: 72cc Intake Runner Volume: 170cc Exhaust Runner Volume: 125cc Intake Valve Diameter: 2.09'' Exhaust Valve Diameter: 1.66'' Valve Stem Diameter: 3/8" Valve Guides: Manganese bronze Deck Thickness: 5/8'' Valve Spring Diameter: 1.55" Valve Spring Maximum Lift: .600" Rocker Stud: N/A Guideplate: N/A Pushrod Diameter: 3/8 Valve Angle: 13° Exhaust Port Location: Stock Spark Plug Fitment: 14mm x 3/4'' Reach,