Proflow Cylinder Heads, LS1 AirMax 235, Holden Commodore, Chevrolet, Aluminium,

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LS1 AirMax 235, Aluminium Cylinder Heads 15deg, Holden Chev, Bare 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. Proflow's 235 AirMax LS1 Cylinder Heads feature our Permanent Mold “As-Cast” Technology surfaces on the intake runners, exhaust runners and combustion chambers that allows for extremely accurate and repeatable port location/performance. This budget friendly head is perfect for your OEM engine operating below 6300 RPM. Material Aluminum A356.2 T6 Combustion Chamber Volume 63cc Intake Runner Volume 235cc Intake Port Size H x W3.23*1.1 Inatke Port Height compared to OE Standard Exhaust Runner Volume 93.6cc Exhaust Port Size H x W 1.41*1.71 Exhaust Port Height compared to OE Standard Intake Valve Size 2.020" Exhaust Valve Size 1.600" Valve Stem Diameter 8.00mm Valve Length 4.88 Valve Angle 15 Degree Valve Guide Seal Diameter 0.5" Valve Guide Material Manganese Bronze Valve Spring Base Diameter 1.358" Deck Thicknesss 5/8