| Brand: | Speedmaster |
| Part Number: | PCE281.1778 |
| Part Type: | Cylinder Head [Bare] |
| Cylinder Head Style: | Bare |
| Cylinder Head Material: | Aluminum |
| Cylinder Head Finish: | Natural |
| Combustion Chamber Volume (cc): | 85 cc |
| CNC-Machined Combustion Chamber: | Yes |
| Intake Runner Volume (cc): | 309 cc |
| Exhaust Runner Volume (cc): | 123 cc |
| CNC-Machined Intake Runner: | No |
| CNC-Machined Exhaust Runner: | No |
| Intake Port Shape: | Round |
| Intake Port Location: | Standard |
| Exhaust Port Shape: | Oval |
| Exhaust Port Location: | Standard |
| Spark Plug Style: | Standard |
| Comp. Valve Job: | No |
| Intake Valves Included: | No |
| Intake Valve Diameter (in): | 2.300 in. |
| Exhaust Valves Included: | No |
| Exhaust Valve Diameter (in): | 1.900 in. |
| Valve Springs Included: | No |
| Damper Spring Included: | No |
| Retainers Included: | No |
| Locks Included: | No |
| Valve Stem Seals Included: | No |
| 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: | Standard |
| Exhaust Valve Angle: | Standard |
| Valve Guides Included: | Yes |
| Valve Guide Material: | Steel |
| 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: | Yes |
| Quantity: | Sold individually. |
| Notes: | Rocker pedestals are built into heads. |
