Proflow Cylinder Heads, AirMax 290, Aluminium, BB Chevrolet, Assembled, 112cc Ch

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Proflow Cylinder Heads, AirMax 290, 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. Perfect for your Mild or High performance Hot Rod. Specifications for Bare Cylinder Heads Specifications & Features: Material A356.2 Aluminum Intake Port Volume 290cc Intake seat size 2.25 OR 2.30 Exhaust seat size 1.88 Intake Port Dimension 2.030"H x 1.830"W x1/2 Radius Intake Port Location Stock Exhaust Port Volume 135cc Exhaust Port Dimension 1.770"H x 2.010" W Exhaust Port Location .375" Raised Combustion Chamber Size 112cc Valve Cover Bolt Pattern Perimeter Bolt Valve Angle 24°/4° Int, 15°/4° Exh Valve Spring Pocket Diameter 1.725" O.D Max Valve Spring Pocket Machining 1.750" O.D Deck Thickness .750" Minimum Bore Diameter 4.250" Flat Mill .006" per cc/ Maximum 102cc Angle Mill .009" per cc/ Maximum 97cc Note:Angle mills might require a .120" Thick intake gasket. Minimum Cross Sectional Area 2.895 sq. in. Spark Plug Dimensions 14mm x .750" w/Gasket Seat Intake Valve Seat Machine Style: 5-angle 11/32" Intake Valve, 2.250" x 5.500" O.A.L 11/32" Nail Head Exhaust Valve, 1.880" x 5.450" Overall Valve Length Racing Springs#1940 1.550" O.D. Hydraulic Roller Dual Valve Spring, 175 lbs. on seat, .725" maximum lift, 473lbs @ .600 lift, Max RPM 6500-6700 Racing Spring 1.550 O.D. Solid Roller Valve Spring, 220lbs on seat, .710" Maximum Lift, Max RPM 7200-7400 (upgrades available) Manley 10° Steel Retainers 1.500" O.D x 1.120"I.D x .705" 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 Valve Spring I.D Locator 1.550" O.D x .780" I.D Intake Valve Seats 2.450" O.D x 1.950" I.D x .375" Deep Exhaust Valve Seats 2.000" O.D x 1.580" I.D x .375" Deep 11/32" Intake Bronze Valve Guides .502" O.D x 2.10" O.A.L 11/32" Exhaust Bronze Valve Guides .502" O.D x 2.25" O.A.L Recommended Components: Intake Port Gasket 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, ARP 135-3703 (Mark IV) Head Bolts, ARP 135-3707 (Mark V) Head Studs, 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 Aftermarket Suggested Manifold Victor Jr Suggested Manifold RPM Performer Spark Plug Starting Range Autolite 3924