BIG-BLOCK CYLINDER HEADS

First-Time Fit Cylinder Heads

Chevrolet Performance cylinders are tested for excellence for durable performance on street or strip.

SERVICE REPLACEMENT HEADS

Chevrolet Performance service replacement cylinder heads are direct replacements on most 1990-and-later GM Big-Block 454-cubic-inch and 502-cubic-inch engines. These cylinder heads meet GM’s stringent quality standards and provide excellent service and durability not found in used cylinder heads. The cylinder heads have rectangular intake ports, which are larger in volume and designed to enhance high-rpm horsepower. They are an ideal street head for those Big-Block enthusiasts who want more power from a street car that sees a lot of drag-strip action.

Service Replacement Head Technical Notes

  • Cast-Iron
  • Rectangular intake ports
  • Machined for 2.180"/1.880" (3/8" stems) valves
  • Non-adjustable rocker arm design
  • Heads have heat risers
  • Will not work on production Mark IV cylinder blocks

ALUMINUM BOWTIE STREET CYLINDER HEADS

Chevrolet Performance Bowtie high-performance street cylinder heads are an ideal combination of street drivability and drag-strip performance. They provide a broad power range with ample low-end torque, excellent throttle response, good mid-range torque and enough top-end power to beat your competitors to the finish line.

Vortec Bowtie Cylinder Head Technical Notes

  • Made from 356-T6 aluminum
  • Available in rectangular- or oval-port designs
  • Will work on Mark IV and Gen V, VI blocks
  • 9/16"-thick decks
  • As-cast intake and exhaust ports
  • No heat risers
  • 1.55" valve spring seat diameter
  • Heli-coiled 7/16" screw-in rocker stud holes
  • Designed for use with 3/8" pushrods
  • Use intake gasket P/N 12366985 and bolt kit P/N 12367959
  • Use head gasket P/N 12363414 for bores to 4.370" and P/N 12363413 for bores 4.470" to 4.540" (Mark IV)
  • Use head gasket P/N 12363412 for bores to 4.370" and P/N 12363411 for bores 4.470" to 4.540" (Gen V, VI)
  • Use head bolt kit P/N 12367779   

RS-X ALUMINUM SPREAD-PORT CYLINDER HEADS

The high-rpm airflow requirements of Pro Stock engines influenced the design of Chevrolet Performance’s RS-X spread-port Big-Block cylinder head design, which is used on the ZZ632 Deluxe crate engine. It uses a raised, symmetrical port design for greater port-flow equalization. The heads are designed for large-displacement high-performance applications, where high-rpm airflow is a must for maximum performance. They’re used with a shaft-style roller rocker system. Assembled heads feature 2,450/1.800-inch titanium valves and beehive-type springs.

RS-X Spread-Port Cylinder Head Technical Notes

  • Made from 356-T6 aluminum
  • Will fit large-bore standard- and tall-deck blocks
  • 0.750” deck
  • Intake port volume (nominal): 449 cc
  • Exhaust port volume (nominal): 161 cc
  • Chamber volume (nominal): 70 cc
  • Intake flow: 481 cfm @ 0.787”
  • Exhaust flow: 347 cfm @ 0.787”
  • Rocker bar required
  • Designed for shaft-mount roller rocker arms
  • Designed for 7/16” pushrods
  • Requires custom exhaust headers

BOWTIE RACE CYLINDER HEADS

Monster-cubic-inch stroker Big-Blocks need lots of air to maximize their performance potential and Chevrolet Performance Bowtie race cylinder heads are designed for that task. They are made of 356-T6 aluminum with huge, raised intake ports, larger valves, smaller combustion chambers and two additional head bolts for increased clamping force.

Bowtie Race Cylinder Head Technical Notes

  • 356-T6 Aluminum
  • 9/16" thick decks
  • No heat risers
  • Will work on Mark IV cylinder block
  • Heli-coiled 7/16" screw-in rocker stud holes
  • As-cast intake and exhaust ports

DRCE PRO STOCK RACE CYLINDER HEADS

Chevrolet Performance DRCE (Drag Racing Competition Engine) Pro Stock cylinder heads are the choice of professional drag racing champions. When races are won by thousandths of a second, there’s no room for second-best parts.

DRCE Pro Stock Race Cylinder Head Technical Notes

  • T355-T7M aluminum construction
  • Complies with NHRA Pro Stock 500-cid, 4.900" bore-spacing rules
  • Symmetrical intake port layout
  • Intake and exhaust ports are extremely small “peanut ports”
  • 7/8" thick decks allow for angle milling or heavy at milling
  • Requires professional porting and machining
  • High-capacity self-purging water jackets
  • Custom aftermarket rocker arm assemblies required

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Unless specifically noted to the contrary herein, vehicles equipped with Chevrolet Performance parts that are emissions-related may not meet U.S., Canadian, and state and provincial laws and regulations relating to motor-vehicle emissions. These parts are designed and intended for use in vehicles operated exclusively for competition: in racing or organized competition on courses separate from public streets or highways. Visit www.chevroletperformance.com/emissions for more details.