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Air Flow Research, Bullitt 14° Ford BB (429-460) Aluminum Heads
Features a different port shape with a more consistent cross-sectional area and new valve positioning compared to the factory pieces. This new clean-sheet design improves engine response, providing increases in horsepower and torque. Available in 280cc, 295cc and 315cc versions with 75cc or 85cc combustion chambers. A raised exhaust port 0.250" is also available. Assembled with stainless steel valves, PAC valve springs, 10° chrome moly retainers and machined locks, 7/16" rocker studs, and 3/8" guide plates.
Part Type: Cylinder Heads
Camshaft Style: Hydraulic Roller
Cylinder Head Material: Cast Aluminum
Cylinder Head Style: Assembled
Combustion Chamber Volume (cc): 85
Intake Runner Volume (cc): 270
Exhaust Runner Volume (cc): 132
Intake Valve Diameter (in): 2.250"
CNC-Machined Exhaust Runner: Yes
CNC-Machined Intake Runner: Yes
CNC-Machined Combustion Chamber: Yes
Intake Port Location: Standard
Intake Valves Included: Yes
Exhaust Port Shape: Rectangular
Exhaust Port Location: Standard
Exhaust Valves Included: Yes
Exhaust Valve Diameter (in): 1.760"
Maximum Valve Lift (in): 0.725"
Valve Springs Included: Yes
Outside Diameter of Outer Spring (in): 1.550"
Number of Springs Per Valve: Dual
Damper Spring Included: Yes
Retainers Included: Yes
Locks Included: Yes
Retainer Material: Steel
Lock Style: 10°
Valve Stem Seals Included: Yes
Valve Stem Seal Style: Positive Stop
Rocker Arms Included: No
Rocker Arm Nuts Included: No
Rocker Arm Studs Included: Yes
Rocker Arm Nut Thread Size: 7/16"-20
Guideplates Included: Yes
Guideplate Pushrod Size: 3/8"
Valve Cover Mounting Style: Perimeter Bolt
Intake Valve Angle: 14
Exhaust Valve Angle: 8
Accessory Bolt Holes Drilled: Yes
Valve Guides Included: Yes
Valve Seat Machine Style: 5-Angle
Valve Guide Material: Bronze
Valve Seat Material: Ductile Iron
Steam Holes Drilled: No
Cylinder Head Color: Natural
Oiling Style: Through pushrod
Heat Crossover: No
Machined for O-Ring: No
Remanufactured: No
Notes: Includes hydraulic roller springs. Due to valve angle and location, custom pistons or notching of existing pistons are required.
Quantity Sold as: A Pair
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