| Brand: | Speedmaster | | Part Number: | PCE281.2078 | | Part Type: | Cylinder Heads | | | | | Cylinder Head Style: | Assembled | | Cylinder Head Material: | Aluminum | | Cylinder Head Finish: | Natural | | Combustion Chamber Volume (cc): | 98 cc | | CNC-Machined Combustion Chamber: | Yes | | Intake Runner Volume (cc): | 300 cc | | Exhaust Runner Volume (cc): | 94cc | | CNC-Machined Intake Runner: | Yes | | CNC-Machined Exhaust Runner: | Yes | | Intake Port Shape: | Round | | Intake Port Location: | Standard | | Exhaust Port Shape: | Square | | Exhaust Port Location: | Standard | | Spark Plug Style: | Standard | | Comp. Valve Job: | No | | Intake Valves Included: | Yes | | Intake Valve Diameter (in): | 2.19 in. | | Exhaust Valves Included: | Yes | | Exhaust Valve Diameter (in): | 1.710 in. | | Valve Springs Included: | Yes | | Maximum Valve Lift (in): | 0.600 in. | | Outside Diameter of Outer Spring (in): | 1.550 in. | | Damper Spring Included: | Yes | | Number of Springs Per Valve: | Dual | | Retainers Included: | Yes | | Retainer Material: | Chromoly steel | | Locks Included: | Yes | | Lock Style: | 10 degree | | Valve Stem Seals Included: | Yes | | Valve Stem Seal Style: | Positive stop | | Rocker Arm Studs Included: | No | | Rocker Arms Included: | No | | Rocker Arm Nuts Included: | No | | Guideplates Included: | No | | Valve Cover Mounting Style: | Perimeter Bolt | | Accessory Bolt Holes Drilled: | Yes | | Intake Valve Angle: | 20 deg. | | Exhaust Valve Angle: | 20 deg. | | Valve Guides Included: | Yes | | Valve Guide Material: | Bronze | | Valve Seats Machined: | Yes | | Valve Seat Machine Style: | 3-angle | | Valve Seat Material: | Ductile iron | | Steam Holes Drilled: | No | | Oiling Style: | Through pushrod | | Machined for O-Ring: | No | | Heat Crossover: | No | | Quantity: | Sold as an assembled pair. | | Calculator | Compression Calculator |
Assembly Specifications
Max Lift: .550
Coil Bind: .740
Intake Install: 130lbs @ 1.9
Exhaust Install: 130lbs @ 1.9
Closed Seat Pressure: 130lbs
Open Seat Pressure: 300lbs
One of the best upgrades to your Big Block Ford engine is the replacement of your cast iron head to a better performing and lighter aluminum head. How great is it that you can now do it at a price that's affordable. Our line of Big Block Ford performance heads have proven themselves time and time again both on the track and on the dyno, not to mention countless features in performance magazine articles. We offer Big Block Ford cylinder heads for a wide range of displacement applications. With bigger displacement engines becoming more common, the need for more airflow is necessary. If you are looking to build a 400-700 horsepower engine then you should consider Speedmaster Aluminum cylinder heads. Like the rest of our performance heads we use our 'Gravity Die Cast' process. This casting process creates a much more uniform and robust cylinder head. They also offer a smaller cross section to increase the incoming air_s velocity resulting in improved drivability, power and economy. We have them available in as cast for the mild street applications and in Fully CNC machined for the serious enthusiast. Speedmaster CNC ported cylinder heads are machined on a dedicated 5 axis CNC machining centers to ensure accuracy and cost effectiveness. Combustion chamber, exhaust and intake ports are fully CNC machined for better flow. CNC combustion chambers offer superior control over flame travel and quench area. CNC ported heads eliminate human error and variation from port to port. | 
