big block engines


Through March 31, get a $100 mail-in rebate on all Chevrolet Performance gasoline engine blocks.

Reign supreme

When torque is king, choose factor-engineered Big-Block power from Chevrolet Performance.


The classic Big-Block production engine was introduced in 1965. Cylinder-block casting combines traditional Big-Block heritage and modern production techniques for 21st-century performance.


Born from a full line of high-quality, precision-machined components based on performance-proven GM designs, a Bowtie Sportsman block packs big power and long-lasting reliability ideal for drag racers and street machines.

Bowtie Sportsman Block Technical Notes

  • Available in short-deck (9.800”) or tall-deck (10.200”) configurations
  • Blocks have clearance for 4,500” tolerance
  • CNC-machined to +/- .005” tolerance
  • Siamese cylinder bores
  • Bore finishers are ready to bore to size
  • Machined for mechanical fuel pump
  • Machined for hydraulic roller and flat tappets
  • Nodular iron 4-bolt main caps splayed 16-degrees on the three center mains
  • Priority main oiling system
  • Blocks with a 1-piece Rear Main Seal use the 6-bolt, Gen VI-style front cover (P/N 10230954) and Gen VI-style oil pan
  • Blocks with a 2-piece Rear Main Seal use the 10-bolt, Mark IV-style front cover and Mark IV-style oil pan


Built from premium materials and precision machined to blueprinted specifications, this fabled aluminum 427-cubic-inch Big-Block lets mere mortals experience the raw horsepower and tremendous torque of the ZL1. 

ZL1 Aluminum Block Technical Notes

  • 356- T6M Aluminum block
  • Standard deck height (9.800")
  • 4.300" maximum bore
  • 4.240" finished bore
  • 4.375" maximum stroke
  • Siamese cylinder walls
  • Centrifugally spun cast-iron cylinder sleeves
  • Steel 4-bolt main caps splayed 16° on the three center mains (dowel located)
  • Provision for hydraulic roller camshafts
  • AN O-ring oil and water plugs
  • Tested to 650 horsepower


With thick deck surfaces and splayed 4-bolt steel bearing caps, a cast-iron Bowtie Race Block is the starting point for drag racers looking for custom-machined performance.

Cast-Iron Bowtie Race Block Technical Notes

  • Precision CNC-machining means +/- 0.005" tolerances
  • Blocks are available in short deck (9.800") or tall deck (10.200")
  • A sonic bore check data sheet is provided with each block
  • Siamese cylinder bores
  • Improved cooling around number-1 cylinder
  • Accepts Mark IV or Gen V, VI cylinder heads
  • Use Gen V head gaskets with Mark IV and Gen V cylinder heads
  • Use Gen VI head gaskets with Gen VI cylinder heads
  • Requires Mark IV design 2-piece rear main seal oil pans
  • Requires Mark IV design crankshafts
  • Can use Mark IV and Gen V, VI camshafts, timing sets, lifters and timing cover (aftermarket belt-drive timing covers may require clearancing)
  • Blind-tapped head bolt holes; extra inner head bolt bosses provided
  • 4-bolt SAE 8620 main caps splayed 16° on the three center mains
  • Priority main oiling wet-sump system
  • Provisions for dry-sump oil line provided
  • Honed camshaft and crankshaft bores
  • 0.842" lifter bores (maximum 1.06") may be relocated
  • Distributor gear clearance at bottom of number-8 cylinder bore should be checked
  • Machined mechanical fuel pump pad


Specifically designed with 500-cubic-inch Pro Stock engines in mind, the DRCE (Drag Racing Competition Engine) family of Big-Blocks is the foundation of many Pro Stock drag-racing engines.

DRCE Block Technical Notes

  • CNC-machined to +/- 0.005" tolerance
  • Siamese cylinder bores with 4.900" spacing
  • No lifter bosses, solid bar can be drilled as required
  • No head-bolt holes
  • Numbers two and four main bearing bulkheads moved 0.060"
  • Bellhousing bolt pattern accommodates Chevy and Pontiac/Olds transmissions
  • Uses Big-Block Chevrolet crank, camshaft, balancer, flywheel and water pump
  • Requires camshaft with distributor gear behind rear bearing
  • Priority main oiling dry-sump system
  • Dual starter mounting locations
  • Front-engine mounts only
  • Each block is supplied with sonic test data sheet



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Unless specifically noted to the contrary herein, vehicles equipped with Chevrolet Performance Parts may not meet Federal Motor Vehicle Safety Standards and emissions regulations and should not be operated on public roads. Chevrolet Performance customers are responsible for ensuring their use of Chevrolet Performance complies with applicable federal, state, and local laws, regulations, and ordinances. Many parts intended for racing or other “off-highway” use are not designed or tested for crashworthiness or to meet the safety needs of the motoring public, and may adversely affect the original intended performance or handling characteristics of the vehicle. These parts are designed and intended to be used with experts supervising their installation and use, to help assure the proper and safe operation of the vehicle.