Proflow Cylinder Heads, AirMax 320 CNC, Aluminium, BB Chevrolet, Assembled, 120c

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Proflow Cylinder Heads, AirMax 320 CNC, Aluminium, BB Chevrolet, Assembled 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. Material A356 Aluminum Intake Port Volume 317cc Intake Port Dimension 2.450"H x 1.755"W x 13/32 Radius Intake Port Location Stock Exhaust Port Volume 135cc Exhaust Port Dimension 1.780"H x 2.025" W Intake Valve Diameter (in): 2.25 in. Exhaust Valve Diameter (in): 1.880 in. Combustion Chamber Size 121cc Valve Springs Pocket I.D. 1.735" Maximum Valve Lift (in): 0.750 in. Outside Diameter of Outer Spring (in): 1.625 in. Lock Style: 10 degree Rocker Arm Nut Thread Size: 7/16-20 in. Valve Cover Mounting Style: Perimeter bolt Intake Valve Angle: 24/4 Exhaust Valve Angle: 15/4 Valve Guide Material: Manganese Bronze Intake Valve Seat Machine Style: 5-angle Valve Seat Material: Mental powder Oiling Style: Through pushrod Recommended Components: Intake Port Gasket (.120" Thick) Intake Port Gasket (.060" Thick) Important: Do not port match your intake manifold to Fel-Pro gasket as it does not precisely fit the heads. Exhaust Port Gasket Head Gasket, Fel-Pro #1047 (Mark V and VI),Head Gasket,, Fel-Pro #1017-1 (Mark IV) Head Bolts, 7/16"-14 x 7/16"-14 ARP 235-7202 ARP 135-3703 (Mark IV), ARP 135-3707 (Mark V),ARP 235-4713 Head Bolt Washers, Manley Stud Girdle 7/16 Stud Mount Rocker Arms - 1.7 Ratio (For Optimized Geometry) 1.7 Shaft Mount Rocker Arms T&D Suggested Manifold Victor Jr,Super Victor Spark Plug Starting Range Pump Gas 3924 / Race Gas 3922 11/32" Intake Valve, 2.250" x5.500" O.A.L 11/32" Tulip Exhaust Valve, 1.880" x 5.450" O.A.L Racing Spring #1224 1.625 O.D. Solid Roller, 275lbs on seat, .850 Maximum Lift, Max RPM 7400-7600 10° Retainers 1.490" O.D x 1.180" I.D x .765" I.D 10° 11/32" Valve Locks with lashcap recess ARP 7/16" Rocker Exhaust Studs ARP 7/16" Rocker Intake Studs 3/8" Guide Plates 11/32" Viton Valve Seals Hardened Spring Cup 1.740" O.D / 1.650" I.D 11/32" Intake Manganese Bronze Valve Guides .502" O.D x 2.10" O.A.L 11/32" Exhaust Maganese Bronze Valve Guides .502" O.D x 2.25" O.A.L