AFR Small Block Chevy 227cc Eliminator Race Aluminum Cylinder Heads

Standard valves are lightweight 8mm diameter stem, 2.100'' intake and 1.600'' exhaust with AFR's hardened ductile iron interlocking valve seats. The 227 has 60/40 valve spacing and piston valve pockets should be checked. The exceptional flow characteristics and 23° valve angle make this the perfect head for 350-434ci engines in drag cars, sprint cars, and late model oval trackers operating from 4500 rpm and up. If you choose to run stud girdles AFR offset girdles are required. These heads requires shaft mount rockers or .050'' offset rocker arms for durability and reliability of valve train components. With the .050'' offset the intake rocker arm will be at a slight angle and the roller tip will not be perfectly parallel or centered on the valve tip. Not recommended for street use, unless shaft mount rocker is used. The exhaust port and bolt pattern are raised .250'' over GM L-98 cylinder head, this rarely affects header or chassis fitment. These 227cc aluminum cyilnder heads are available in either standard port or spread port exhaust configurations. Spread port heads have the center exhaust ports spread apart 5/8'' over stock L98 GM heads. The reason for spread port heads is to achieve additional cooling in the center of the head where the heat concentration is greatest. As standard headers do not fit, spread port headers are required since the center ports are spread further apart then stock GM products. The increased spacing on the exhaust port also requires the use of exhaust gasket Fel-Pro p/n 375-1409. Spread port heads only come with a Stahl bolt pattern. AFR's spread port head has all the benefits and features of AFR's standard head. .

227cc Eliminator Race Cylinder Head Features:

• 100% CNC Ported Combustion Chambers
• 100% CNC Ported Exhaust Ports
• 100% CNC Ported Intake Ports
• Competition 5-angle Valve Job
• 227cc Intake Ports
• 80cc Exhaust Ports
• Bead Lock Intake Valve, 2.100'' x 5.006'' Overall Valve Length
• Bead Lock Exhaust Valve, 1.600'' x 5.024'' Overall Valve Length
• PAC Racing Valve Spring: 1.550'' OD Solid Roller Dual Valve Spring, 225 lbs on seat, .710'' maximum lift, Max RPM 7200-7400
• 10° Manley 4140 Chrome Moly Retainers
• 10° Bead Lock Valve Keepers
• 7/16'' Rocker Studs
• Adjustable 5/16'' Guide Plates
• Viton Valve Seals
• Hardened Spring Cup
• Intake Valve Seats
• Exhaust Valve Seats
• Bronze Valve Guides
• Standard or Spread Port Exhaust Bolt Pattern

>