Chevy GM LS3 L92 L76 250cc 64cc Hydraulic Roller Assembled Cylinder Heads

Description

PCE281.2091
Brand:
Speedmaster
Part Number:
PCE281.2091
Part Type:
Cylinder Heads
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.
Calculator:
Compression Calculator
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.
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