Proflow Cylinder Heads, AirMax 320, Aluminium, BB Chevrolet, Assembled, 120cc Chamber, 315cc Intake Runner, 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. This BBC cylinder head is recommended for agressive street or street/strip applications with displacements up to 540 cubic inches, operating at or below 6800 RPM. 1.625 O.D. Solid Roller, 275lbs on seat, .850 Maximum Lift. SPECIFICATIONS Combustion Chamber 120 cc Intake Port Volume 320 cc Intake Port Dimensions 2.45” (H) x 1.75” (W) Exhaust Port Volume 125 cc Exhaust Port Dimensions 1.75” (H) x 2.00 (W) Spark Plug Location Angled Intake Valve Diameter 2.25” Exhaust Valve Diameter 1.88” Valve Stem Diameter 11/32” Valve Spring Pocket ID 1.735” Valve Guide OD 0.530” (0.570” at base) Maximum Valve Lift 0.750” Rocker Stud Thread Size 7/16”-14 Valve Angle 24° Intake/15° Exhaust Deck Thickness 0.750”