Proflow Cylinder Heads, AirMax 170, Aluminium, Assembled 60cc Chamber, 170cc Intake Runner, SB For Ford 289, 302, 351W, 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. Note: We suggest using Proflow Head Bolt Stepped washers part number PFEAHF-HBW Proflow head bolt insert washers are designed to be used on Ford Windsor cylinder heads in applications where you have 7/16" head bolts being used in 1/2" bolt hole Stops head bolt hole distorting on aluminium heads when using 7/16 bolts on 289 / 302 standard Windsor block SPECIFICATIONS Combustion Chamber 60 cc Intake Port Volume 170 cc Intake Port Dimensions 2.00” (H) x 1.18” (W) Exhaust Port Volume 66 cc Exhaust Port Dimensions 1.32” (H) x 1.27” (W) Spark Plug Location Angled Intake Valve Diameter 2.020” Exhaust Valve Diameter 1.600” Valve Stem Diameter 11/32” Valve Spring Pocket ID 1.50” Valve Guide OD 0.530” (0.560” at base) Maximum Valve Lift 0.600” Rocker Stud Thread Size 7/16”-14 Valve Angle 20° Deck Thickness 0.625” Installed Spring Height 1.80” @ 125lbs