HIGH DEMAND ALERT: Shipping may be slightly delayed!
Thank you for making our Black Friday Sale such a huge success! Due to the overwhelming demand, some orders placed during the sale are still being processed. If your Black Friday order is pending, rest assured that it will be shipped soon.
For new orders, please note that slight shipping delays may still occur as our team continues working around the clock to fulfill all orders as quickly as possible. We deeply appreciate your patience and support during this busy time. Stock is moving fast, so don’t wait—shop now to secure your favorites!
Thank you for making our Black Friday Sale such a huge success! Due to the overwhelming demand, some orders placed during the sale are still being processed. If your Black Friday order is pending, rest assured that it will be shipped soon.
For new orders, please note that slight shipping delays may still occur as our team continues working around the clock to fulfill all orders as quickly as possible. We deeply appreciate your patience and support during this busy time. Stock is moving fast, so don’t wait—shop now to secure your favorites!
Speedmaster®
Chevy GM LS3 L92 L76 250cc 64cc Hydraulic Roller Assembled Cylinder Heads
Overview
Speedmaster LS-series cylinder heads are rapidly expanding. The LS (Gen3/4) platform has many design benefits over the earlier SBC engine designs, most notably the cylinder heads. Although the GM heads are good pieces, We have developed a superior line of heads for modern performance enthusiasts. Like all Speedmaster cylinder heads, the LS-series heads are produced using our "Gravity Casting" process. This process ensures a more uniform and robust casting, laying a strong platform to build on.
Specs
| Brand: | Speedmaster |
| Part Number: | PCE281.2091 |
| Part Type: | Cylinder Head |
| Product Line: | Hydraulic Roller Tappet |
| Cylinder Head Style: | Assembled |
| Cylinder Head Material: | Aluminum |
| Cylinder Head Finish: | Natural |
| Combustion Chamber Volume (cc): | 64 cc |
| CNC-Machined Combustion Chamber: | No |
| Intake Runner Volume (cc): | 250 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: | Oval |
| Exhaust Port Location: | Standard |
| Spark Plug Style: | OEM |
| Comp. Valve Job: | No |
| Intake Valves Included: | Yes |
| Intake Valve Diameter (in): | 2.165 in. |
| Exhaust Valves Included: | Yes |
| Exhaust Valve Diameter (in): | 1.600 in. |
| Valve Springs Included: | Yes |
| Maximum Valve Lift (in): | 0.625 in. |
| Outside Diameter of Outer Spring (in): | 1.290 in. |
| Damper Spring Included: | Yes |
| Number of Springs Per Valve: | Dual |
| Retainers Included: | Yes |
| Retainer Material: | Chromoly steel |
| Locks Included: | Yes |
| Lock Style: | 7 degree |
| Valve Stem Seals Included: | Yes |
| Valve Stem Seal Style: | Positive stop |
| Rocker Arm Studs Included: | N/A |
| Rocker Arms Included: | No |
| Rocker Arm Nuts Included: | No |
| Guideplates Included: | N/A |
| Valve Cover Mounting Style: | Perimeter Bolt |
| Accessory Bolt Holes Drilled: | Yes |
| Intake Valve Angle: | 15 deg. |
| Exhaust Valve Angle: | 15 deg. |
| 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: | N/A |
| Oiling Style: | Through pushrod |
| Machined for O-Ring: | No |
| Heat Crossover: | No |
| Quantity: | Sold as a pair. |
Description
Assembly Specifications
Max Lift: .625"
Coil Bind: 1.180"
Intake Install: 140lbs @ 1.8
Exhaust Install: 140lbs @ 1.8
Open Seat Pressure: 335lbs @ .600 lift
Prop 65 Warning
This product may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.