- Engines & Components
- Cylinder Heads
- AFR Big Block Ford 270cc Bullitt Aluminum Cylinder Heads
14° Small Port, High Torque Street / Strip Heads
''Blue Oval'' big block performance is alive and well at Air Flow Research with a much needed clean sheet redesign of the aging BBF cylinder head. Starting with the needlessly large OEM port their design team decreased overall runner size while giving it a more consistent cross sectional area. This change is designed to increase peak power while notably boosting the torque, responsiveness and fuel efficiency. They carefully shaped the combustion chamber and positioned the valves to compliment intake and exhaust port design while efficiently utilizing the cylinder bore.
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The improvement in valve positioning allowed them to address the ''Achilles Heel'' of the BBF head, the exhaust port. By filling the floor of the exhaust port without raising the height AFR has improved high flow lift while increasing flow at low and mid lifts, achieving a 75% intake to exhaust flow ratio with their exhaust port in the stock location reaching 260 cfm with these 132cc ports. The high flow stock exhaust location allows for stock header and chassis fitment.
AFR's Big Block Ford 270cc ''As Cast'' cylinder heads are the cost effective performance choice over re-worked factory cylinder heads. This A356 aluminum casting cylinder head features partially CNC-ported intake runners, exhaust ports, combustion chambers, and high quality valve train components with standard exhaust port locations. Recommended for street, towing, or street/strip engines with displacements up to 477 cubic inches, operating up to 6200 RPM. Application specific pistons or fly cutting of your current pistons are required due to the revised valve locations and angles of the AFR Bullitt heads. .
270cc Bullitt Street Cylinder Head Features:
- 50% CNC Ported Combustion Chambers
- 80% CNC Bowl Blend Exhaust Ports
- 80% CNC Bowl Blend Intake Ports
- Competition 5-angle Valve Job
- 270cc Intake Ports
- 132cc Exhaust Ports
- Intake Valve, 2.250'' x 5.245'' Overall Valve Length
- Exhaust Valve, 1.760'' x 5.050'' Overall Valve Length
- Hydraulic Roller Valve Spring: 1.550'' OD Dual Spring, 175 lbs. on seat, .725'' max lift (Max RPM 6500-6700)
- Solid Roller Valve Spring: 1.550'' OD Dual Drag Race Spring, 220 lbs. on seat, .680'' max lift (Max RPM 7200-7400)