Proflow Cylinder Heads, LS SuperMax 276, Aluminium, Rect Bare Cylinder Heads (6Bolt) , 70cc Chamber, 273cc, 15deg, LS3 For Chevrolet For Holden, 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. Use CC-6051 & 6053 valves SPECIFICATIONS Combustion Chamber 70 cc Intake Port Volume 276 cc Exhaust Port Volume 90 cc Exhaust Port Dimensions 1.47” (H) x 1.65” (W) Spark Plug Location OEM Intake Valve Diameter 2.165” Exhaust Valve Diameter 1.59” Valve Stem Diameter 8 mm Valve Spring Pocket ID 1.30” Valve Guide OD 0.502” (0.560” at base) Maximum Valve Lift 0.750” Rocker Stud Thread Size OE LS3 Style Valve Angle 15° Deck Thickness 0.625”