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Cylinder Head BBC Oval

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$1,895.00 (excluding tax)

Product Description

BBC 290 specifications  
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 T&D  
Suggested Manifold Victor Jr
Suggested Manifold RPM Performer
Spark Plug Starting Range Autolite 3924
Specifications & Features:
Material A356.2 Aluminum
Intake Port Volume 290cc
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
recommended for moderate street or street/strip big block chevys with displacements up to 509 cubic inches, operating at or below 6500 RPM