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 63 cc
Intake Port Volume 179 cc
Intake Port Dimensions 2.28” x 1.16”
Exhaust Port Volume 79 cc
Exhaust Port Dimensions 1.75” (H) x 1.25” (W)
Spark Plug Location Angled
Intake Valve Diameter 2.02”
Exhaust Valve Diameter 1.60”
Valve Stem Diameter 11/32”
Valve Spring Pocket ID 1.50”
Valve Guide OD 0.530” (0.560” at base)
Rocker Stud Thread Size 7/16”-14
Valve Angle 18
Deck Thickness 0.625”