Like all Speedmaster cylinder heads, the Mopar heads are produced using our "Gravity Casting" process. This process ensures a more uniform and robust casting, laying a strong platform to build on.
These heads are set up for a Hydraulic Roller Cam.
Assembly Specifications
Max Lift: .650
Coil Bind: .1.125
Intake Install: 145lbs @ 1.9
Exhaust Install: 145lbs @ 1.9
Closed Sear Pressure: 135lbs
Open Seat Pressure: 280lbs
Grab a set and you'll be another satisfied Speedmaster - RACE Proven Products customer.
We have sold hundreds of sets of Speedmaster heads without a single complaint and the material and casting quality is second to none.
Sold as a pair.
FREE Ground Shipping in the U.S. 48. Ships directly from Speedmaster's Rialto CA Warehouse.
| Brand: | Speedmaster |
| Part Number: | PCE281.2153 |
| Part Type: | Cylinder Heads |
| Cylinder Head Style: | Assembled |
| Cylinder Head Material: | Aluminum |
| Cylinder Head Finish: | Natural |
| Combustion Chamber Volume (cc): | 74 cc |
| CNC-Machined Combustion Chamber: | Yes |
| Intake Runner Volume (cc): | 265 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: | Rectangular |
| Exhaust Port Location: | Standard |
| Spark Plug Style: | Standard |
| Comp. Valve Job: | No |
| Intake Valves Included: | Yes |
| Intake Valve Diameter (in): | 2.200 in. |
| Exhaust Valves Included: | Yes |
| Exhaust Valve Diameter (in): | 1.810 in. |
| Valve Springs Included: | Yes |
| Maximum Valve Lift (in): | 0.650 in. |
| Outside Diameter of Outer Spring (in): | 1.550 in. |
| Damper Spring Included: | Yes |
| Number of Springs Per Valve: | Single |
| 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: | 15 deg. |
| Exhaust Valve Angle: | 15 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. |