Proflow Cylinder Heads, AirMax 170, Aluminium, Bare, 72cc Chamber, 170cc Intake Runner, Big Block Ford FE ,390-428, Pair

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. SPECIFICATIONS Combustion Chamber 72 cc Intake Port Volume 170 cc Intake Port Dimensions 2.065” (H) x 1.360” (W) Exhaust Port Volume 125 cc Exhaust Port Dimensions 1.85” (H) x 1.27” (W) Spark Plug Location Angled Intake Valve Diameter 2.09” Exhaust Valve Diameter 1.65” Valve Stem Diameter 3/8” Valve Spring Pocket ID 1.725” Valve Guide OD 0.562” Rocker Stud Thread Size Shaft Type Valve Angle 13° Deck Thickness 0.625”