Outdated Internet Browser Detected

The Internet Browser you are using cannot establish a secure connection to SummitRacing.com which will prevent you from being able to Log In or Checkout. This is most likely because SSL 3.0 is your default SSL setting. This makes you vulnerable to the "POODLE exploit" and to ensure your security, it is not allowed on our site. Please change your browser security settings to not allow SSL 3.0 or attempt to update your browser using these links.

In-Store Pickup Location Close

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

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

Loading media


In progress
Get Totally Free Shipping with Your Order!

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

Estimated Ship Date: Today Would you rather pick it up? Select Location

  • Order this item and get free delivery and handling on your entire order! Oversize fees also waived on this item. Valid on orders shipped in the contiguous United States.

Brand: Summit Racing

Manufacturer's Part Number: SUM-152125

Part Type: Cylinder Heads

Product Line: Summit Racing® Cast Iron Cylinder Heads for Big Chevy

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.

Calculator Compression Calculator

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.

Warranty

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

Back To Results
Email this page Close
Close