Speedmaster®
Oldsmobile 400 425 455 188cc 77cc Hydraulic Flat Assembled Cylinder Heads
Specs
| Brand: | Speedmaster |
| Part Number: | PCE281.2152 |
| Part Type: | Cylinder Heads |
| Cylinder Head Style: | Assembled |
| Cylinder Head Material: | Aluminum |
| Cylinder Head Finish: | Natural |
| Combustion Chamber Volume (cc): | 77 cc |
| CNC-Machined Combustion Chamber: | No |
| Intake Runner Volume (cc): | 188 cc |
| Exhaust Runner Volume (cc): | n/a |
| CNC-Machined Intake Runner: | No |
| CNC-Machined Exhaust Runner: | No |
| Intake Port Shape: | Rectangular |
| Intake Port Location: | Standard |
| Exhaust Port Shape: | Square |
| Exhaust Port Location: | Standard |
| Spark Plug Style: | OEM |
| Comp. Valve Job: | No |
| Intake Valves Included: | Yes |
| Intake Valve Diameter (in): | 2.072 in. |
| Exhaust Valves Included: | Yes |
| Exhaust Valve Diameter (in): | 1.680 in. |
| Valve Springs Included: | Yes |
| Maximum Valve Lift (in): | 0.615 in. |
| Outside Diameter of Outer Spring (in): | 1.450 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: | Center & Perimeter Bolt |
| Accessory Bolt Holes Drilled: | Yes |
| Intake Valve Angle: | 18 deg. |
| Exhaust Valve Angle: | 18 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 a pair. |
| Calculator | Compression Calculator |
Description
Assembly Specifications
Max Lift: .615
Coil Bind: .1.125
Intake Install: 140lbs @ 1.8
Exhaust Install: 140lbs @ 1.8
Closed Seat Pressure: 145lbs
Open Seat Pressure: 345lbs
Brand Information
In 1979, the company was founded with Pete's Performance, which was a small speed workshop. It began by building engines for customers as a hobby, and it has now grown to include selling, assembling, manufacturing and racing high performance engine parts. Over the years, the company has grown into a worldwide high performance powerhouse. Growing from a one-man bricks-and-mortar business; to now a supply chain in which entails more than 400+ people all across the world. Today, Pete's Performance has evolved into the internationally known Speedmaster: which has distribution centres and offices is Sydney, Los Angeles and Shanghai.