GM Performance Cylinder Head, Bare, Cast Iron, 118cc Combustion Chamber, Chevy, Big Block, 454/502, Each (PART #GMP-12562925)

These GM Performance High Output crate engine cast iron cylinder heads are designed for use with the Gen V and Gen VI design, 454 big block V8 crate engines. They feature a 118cc open combustion chamber with 2.18 in. intake valves and 1.88 in. exhaust valves with rectangular intake ports. The cylinder heads use 3/8 in. rocker arm holes for standard stud-mount type rocker arms.

SPECIFICATIONS
Brand GM Performance
Manufacturer's Part Number 12562925
Part Type Cylinder Heads
Product Line GM Performance High Output Crate Engine Cast Iron Cylinder Heads
Combustion Chamber Volume (cc) 118
Intake Runner Volume (cc) 325cc
Exhaust Runner Volume (cc) 110cc
Cylinder Head Style Bare
Cylinder Head Material Cast iron
Intake Port Shape Rectangular
Intake Valve Diameter (in.) 2.180 in.
CNC-Machined Combustion Chamber No
CNC-Machined Intake Runner No
CNC-Machined Exhaust Runner No
Combustion Chamber Style Open chamber
Intake Port Location Standard
Exhaust Port Shape Square
Exhaust Port Location Standard
Spark Plug Style Angle
Intake Valves Included No
Exhaust Valves Included No
Exhaust Valve Diameter (in.) 1.880 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
Valve Guides Included No
Valve Seats Machined No
Valve Seat Material Steel
Cylinder Head Color Natural
Steam Holes Drilled No
Oiling Style Through pushrod
Machined for O-Ring No
Heat Crossover No
Remanufactured No
Quantity Sold individually.
Notes Will not fit GM Mark IV cylinder blocks. Will not work on L29 engine.

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