300cc Bullitt Series Cylinder Heads 300cc Intake Ports

Name: 300cc Bullitt Series Cylinder Heads 300cc Intake Ports
Brand: AFR - AIRFLOW RESEARCH
SKU: 033-3838
Price: 3451.00 USD
Availability: OutOfStock

Currently Unavailable

This product is no longer available. Please call customer service for assistance at 1-800-345-4545.

300cc Bullitt Series Cylinder Heads

85cc Combustion Chamber Volume

.250'' Raised Exhaust Port Location

300cc Intake Ports
85cc Combustion Chambers
2.300'' Int / 1.760'' Exh Valves
1.625'' Dia. Springs
Solid Roller 275# Seat Pressure
10° Steel Retainers
.250 Raised Exh Port
Assembled 2/pkg

Cylinder Head Specifications
Material: A356 Aluminum
Intake Port Volume: 300cc; 2.275' H x 1.850' W x .575 Radius; Stock Location
Exhaust Port Volume: 142cc; 1.850' H x 1.600' W; .250' Raised Port Location
Combustion Chamber Volume: 85cc
Valves: 2.300' dia. x 5.245' o.a.l. Intake / 1.760' dia. x 5.050' o.a.l. Exhaust ( 11/32' Stem Diameter )
Valve Springs: (PAC Racing) Solid Roller 1.625' Diameter - Closed Pressure: 275 lbs.; Max Lift: .850'
Spring Retainers: 1.500' O.D. x 1.168' I.D. x 0.844'I.D. - 10° Manley Steel Retainers
Valve Locks: 10° 11/32' Beadlock with Lash Cap Recess
Rocker Studs: 7/16' (ARP)
Guide Plates: 3/8' Adjustable
Valve Seals: 11/32' Viton
Hardened Valve Spring I.D. Locator: 1.550' O.D. x 0.780' I.D.
Intake Valve Seats: 2.450' O.D. x 1.950' I.D. x 0.375' Deep
Exhaust Valve Seats: 1.900' O.D. x 1.400' I.D. x 0.375' Deep
Valve Guides: 11/32' Bronze, 0.531' O.D. x 2.250' O.A.L.
Valve Spring Pocket Diameter: 1.750' O.D.
Deck Thickness: 0.750'
Minimum Bore Diameter: 4.360'
Facts and Related Components
Intake Gasket: SCE p/n 829-235104
Head Gasket: (4.500' Bore Gasket) Fel-Pro p/n 375-1018, Cometic p/n 245-C5667-040
Exhaust Gasket: Fel-Pro p/n 375-1420
Head Bolts: ARP p/n 070-155-3603
Head Studs: ARP p/n 070-155-4203 (12-point)
Head Bolt Washers: AFR p/n 033-6320
Spark Plug Specs: 14mm Thread, .750' (3/4') Reach, Gasket Seat
Valve Angle: 14° Intake / 8° Exhaust
Pushrod Slots: Standard
Pushrods: Check pushrod clearance with head installed on the engine block before final assembly
Stud Girdle: AFR p/n 033-6209
Rocker Arms: Standard
Lifters: Standard
Spring Pockets: May not be cut any larger than 1.750'
Accessory Bolt Holes are Drilled
Recommended Intake Manifold: AFR Single Plane 4150 Carb Pad (p/n 033-4992) / 4500 Carb Pad (p/n 033-4993)

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART

The Ultimate 14° BBF Race 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. 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 284 cfm with these 142cc ports. These high flow heads feature a .250'' raised exhaust port location. Stock header and chassis fitment may be an issue for tight engine compartments and chassis.

The 300cc heads are AFR's largest and best flowing BBF heads! They feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings, and high quality components throughout. These heads are best suited for large displacement high RPM Big Block Ford racing engines or radical ''Pro Street'' style builds. 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. .

300cc Bullitt Street Cylinder Head Features:

100% CNC Ported Combustion Chambers
100% CNC Bowl Blend Exhaust Ports
100% CNC Bowl Blend Intake Ports
Competition 5-angle Valve Job
300cc Intake Ports
142cc Exhaust Ports
Intake Valve, 2.300'' 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: 1.625'' OD Dual Drag Race Spring, 275 lbs. on seat, .850'' max lift (Max RPM 7400-7600)