GM Performance Cylinder Heads, Oval Port, Aluminum, Assembled, 110cc Chamber, 290cc Intake Runner, Chevy, 7.4L/454, Each (PART #GMP-12363392)

GM Performance oval port aluminum cylinder heads are fully machined with semi-finished bronze alloy guides and valve seats. They feature high-velocity 290cc intake runners to enhance midrange throttle response and torque. The exhaust runner volume is 110cc, which will provide a very streetable compression ratio. The valve spring diameter is 1.550 in. with 7/16 in. rocker stud holes. The heads will accept all stock accessory brackets.

SPECIFICATIONS

Brand GM Performance
Manufacturer's Part Number 12363392
Part Type Cylinder Heads
Product Line GM Performance Oval Port Aluminum Cylinder Heads
Combustion Chamber Volume (cc) 110
Intake Runner Volume (cc) 290cc
Exhaust Runner Volume (cc) 110cc
Cylinder Head Style Assembled
Cylinder Head Material Cast aluminum
Intake Port Shape Oval
Intake Valve Diameter (in.) 2.190 in.
CNC-Machined Combustion Chamber No
CNC-Machined Intake Runner No
CNC-Machined Exhaust Runner No
Combustion Chamber Style Semi-open
Intake Port Location Standard
Exhaust Port Shape D-port
Exhaust Port Location Standard
Intake Valves Included Yes
Exhaust Valves Included Yes
Exhaust Valve Diameter (in.) 1.880 in.
Valve Springs Included Yes
Maximum Valve Lift (in.) 0.680 in.
Outside Diameter of Outer Spring (in.) 1.550 in.
Damper Spring Included No
Number of Springs Per Valve Dual
Retainers Included Yes
Retainer Material Steel
Locks Included Yes
Lock Style 10 degree
Valve Stem Seals Included Yes
Valve Stem Seal Style Umbrella
Rocker Arm Studs Included Yes
Rocker Arm Nut Thread Size 7/16 in.-20
Rocker Arms Included No
Rocker Arm Nuts Included No
Guideplates Included Yes
Guideplate Pushrod Size 3/8 in.
Accessory Bolt Holes Drilled Yes
Valve Guides Included Yes
Valve Guide Material Bronze
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.