Cylinder Heads, Aluminium, Bare, SB Chev, 64cc Chamber, Straight Plug, 180cc Intake Runner, Pair

Proflow Cylinder Heads, AirMax 180,SB Chev Aluminium, Bare, 64cc Chamber 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 & Features: Material A356 Aluminum Intake Port Volume 180cc Intake seat size 2.02 Exhaust seat size 1.6 Intake Port Dimension 2.050" H x 1.250" W x 5/16° Radius Intake Port Location Stock Exhaust Port Volume 64cc Exhaust Port Dimension 1.450" H x 1.550" W Exhaust Port Location 0.100" Raised Combustion Chamber 65cc or 72cc Valve Cover Bolt Pattern Perimeter Bolt Valve Angle 23° Valve Spring Pocket Diameter 1.460" O.D Max Valve Spring Pocket Machining 1.750" O.D Warning: Do not machine spring pad any deeper. Deck Thickness .750" Minimum Bore Diameter 4.000" Flat Mill .006" per cc 60cc Maximum Angle Mill .009" per cc 55cc Maximum Note: Angle mills might require .120 thick intake gasket. Minimum Cross Sectional Area 1.810 sq. in. Spark Plug Dimensions 14mm x .750" w/Gasket Seat Carb EO# D-250-2 Straight Plug Angle Plug option Important: Do not port match your intake manifold to Fel-Pro gasket as it does not precisely fit MIC heads. 8mm Bead Lock Intake Valve, 2.020" x 4.900" Overall Valve Length Ferrea 8mm Bead Lock Exhaust Valve, 1.600" x 4.950" Overall Valve Length Ferrea PAC Racing Spring 1.290" OD Hydraulic Roller Dual Valve Spring, 140 lbs on seat, .600" maximum lift, Max RPM 6300-6500 7° Manley Chrome Moly Retainers 1.245" O.D x .885" I.D x .655" I.D 7° Bead Lock Valve Keepers 3/8" Rocker Studs 5/16" Guide Plates Viton Valve Seals .600" O.D x .495" I.D Hardened Valve Spring O.D Locator 1.380" O.D x .570" I.D Powder Metallurgy Intake Valve Seats 2.200" O.D x 1.750" I.D x .375" Deep Powder Metallurgy Exhaust Valve Seats 1.696" O.D x 1.325" I.D x .305" Deep