race blocks

SMALL-BLOCK CHEVROLET PERFORMANCE RACE BLOCKS

24502503

350 CAST-IRON BOWTIE RACE BLOCK

  • Cast-iron competition block right out of the box
  • 4-bolt steel mains, 20° splayed caps on center three mains
  • 2.000” O.D. cam bearings (1.867” I.D.) required at all five locations
  • 3.980” finished bore
  • 4.155” max bore (siamesed cylinder bores)
  • 9.025” deck height
  • Oil galleries for dry-sump system are oversized and tapped for pipe plugs
  • Supplied with sonic data sheet
  • Tested to over 700-horsepower  

24502650

283 MAIN, 350 BORE SIZE SHORT-DECK BOWTIE RACE BLOCK

  • CNC cast-iron competition block designed for drag racing, road racing, or restricted oval track racing
  • 4-bolt steel mains, 20° splayed caps on center three mains
  • 8.325” deck (standard-deck blocks are 9.025”); can be machined to 8.220” deck height
  • Camshaft is raised 0.422” to 4.955”
  • Cam bearing bores machined for 2.250” O.D. X 1.875 roller bearings
  • 3.980” rough bore
  • 4.185” max bore (minimum of .250 cylinder bore wall thickness)
  • Integral oil restrictors  
  • Must use Big-Block water pump, must raise water pump with adapters for balancers larger than 6”
  • Oldsmobile Aurora V-8 bell housing bolt pattern (12.24” max flywheel diameter) 
  • Lifter holes and cylinder head bolt holes are not drilled
  • Will accept standard, SB2.2 and splayed valve lifter patterns
  • Can be machined to accept any Small-Block Chevy cylinder head 
  • Shorter-than-production pushrods required
  • Tested to 800-horsepower
  • Water jacket core plugs are 1.5” press-in 
  • Oil galley plugs are AN O-ring style   

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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.

  • The Manufacturer's Suggested Retail Price excludes tax, shipping and installation. Individual retailer pricing may vary. Please see your local dealer or retailer for details.

  • The Manufacturer's Suggested Retail Price excludes destination freight charge, tax, title, license, dealer fees and optional equipment. Click here to see all Chevrolet vehicles' destination freight charges.

  • The Manufacturer's Suggested Retail Price excludes destination freight charge, tax, title, license, dealer fees and optional equipment. Click here to see all Chevrolet vehicles' destination freight charges.

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  • Do not use summer-only tires in winter conditions, as it would adversely affect vehicle safety, performance and durability. Use only GM-approved tire and wheel combinations. Unapproved combinations may change the vehicle’s performance characteristics. For important tire and wheel information, go to my.chevrolet.com/learn/tires or see your dealer.

  • Requires available Performance Exhaust or Z51 Performance Package.

  • Requires available Performance Exhaust or Z51 Performance Package.

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  • The Manufacturer's Suggested Retail Price excludes destination freight charge, tax, title, license, dealer fees and optional equipment. Click here to see all Chevrolet vehicles' destination freight charges.