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Summit Racing® Cast Iron Cylinder Heads for Big Chevy SUM-152125

Summit Racing SUM-152125 - Summit Racing® Cast Iron Cylinder Heads for Big Chevy

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$789.50

Cylinder Head, Cast Iron, Assembled, 121cc Chamber, 308cc Intake Runner, Chevy, 396, 402, 427, 454, Each

  • The part SUM-152125 has an additional shipping charge of $8.00 per item due to its large size and/or weight.

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Brand: Summit Racing
Manufacturer's Part Number: SUM-152125
Part Type: Cylinder Heads
Summit Racing Part Number: SUM-152125

Cylinder Head Style: Assembled
Cylinder Head Material: Cast iron
Cylinder Head Finish: Natural
Combustion Chamber Volume (cc): 121
CNC-Machined Combustion Chamber: No
Intake Runner Volume (cc): 308cc
Exhaust Runner Volume (cc): 129cc
CNC-Machined Intake Runner: No
CNC-Machined Exhaust Runner: No
Combustion Chamber Style: Heart
Intake Port Shape: Rectangular
Intake Port Location: Standard
Exhaust Port Shape: Square
Exhaust Port Location: Raised
Intake Valves Included: Yes
Intake Valve Diameter (in): 2.250 in.
Exhaust Valves Included: Yes
Exhaust Valve Diameter (in): 1.880 in.
Valve Springs Included: Yes
Maximum Valve Lift (in): 0.660 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: Steel
Locks Included: Yes
Lock Style: 10 degree
Valve Stem Seals Included: Yes
Valve Stem Seal Style: Positive stop
Rocker Arm Studs Included: Yes
Rocker Arm Nut Thread Size: 7/16-20 in.
Rocker Arms Included: No
Rocker Arm Nuts Included: No
Guideplates Included: Yes
Guideplate Pushrod Size: 3/8 in.
Valve Cover Mounting Style: Perimeter bolt
Accessory Bolt Holes Drilled: Yes
Intake Valve Angle: 24
Exhaust Valve Angle: 15
Valve Guides Included: Yes
Valve Guide Material: Manganese bronze intake/Phosphorous bronze exhaust
Valve Seats Machined: Yes
Valve Seat Machine Style: 4-angle intake/3-angle exhaust
Valve Seat Material: Ductile iron
Steam Holes Drilled: No
Oiling Style: Through pushrod
Machined for O-Ring: No
Heat Crossover: No
Quantity: Sold individually.
Notes: Installation requires .200 to .250 inch longer pushrods; measurements must be taken before ordering pushrods. Exhaust ports raised 0.300 in., fits most standard headers. Valve spring installed at 1.900 inch 145 pounds with max lift of .660 inches. The recommended starting point spark plugs are FRM-AR3924 (street) and FRM-AR3933 (race) or equivalents.
In-Store Pickup: Choose In-store pick-up (OH, GA, NV) on our web site.

Think you have to scour the local bone yards to find a decent set of big Chevy cylinder head castings? Not true. In fact, we've brought back classic Chevy performance in a big way with these ready-to-run heads for big block Chevy. Our versions of the popular GM cylinder heads offer great performance for less than it would cost to rebuild an old set of castings.

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Some parts are not legal for sale or use in California on any pollution-controlled motor vehicles

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