BIG-BLOCK FLYWHEELS 

14085720

1965–up

  • Outside diameter: 12.750"
  • Crank flange bolt pattern: 3.580"
  • Clutch diameter: 10.400"
  • Starter ring gear teeth: 153
  • Lightweight nodular iron
  • Weighs approximately 15 lbs
  • For internally balanced engines

3991469

1965–up

  • Outside diameter: 14"
  • Crank flange bolt pattern: 3.580"
  • Clutch diameter: 11.000"
  • Starter ring gear teeth: 168
  • For internally balanced engines

3993827

1970-1990

  • Outside diameter: 14"
  • Crank flange bolt pattern: 3.580"
  • Clutch diameter: 11.000"
  • Starter ring gear teeth: 168
  • Counterweighted for externally balanced 454 Mark-IV 2-piece rear seal engines
  • Use with balancer P/N 10216339

14096987

1991-up

  • Outside diameter: 14"
  • Crank flange bolt pattern: 3.580"
  • Clutch diameter: 11.000"
  • Starter ring gear teeth: 168
  • Lightweight nodular iron
  • For externally balanced engines

12582964

1965-up

  • Outside diameter: 14"
  • Crank flange bolt pattern: 3.580"
  • Clutch diameter: 11.500"
  • Starter ring gear teeth: 168
  • Used with 427 or 572 crate engine
  • For internally balanced engines

BIG-BLOCK FLEXPLATES

10185034

1991-up

  • Outside diameter: 14"
  • Crank flange bolt pattern: 3.580"
  • Clutch diameter: 10.750"; 11.500"
  • Starter ring gear teeth: 168
  • Use with forged-steel crank
  • Has dual-converter bolt pattern (502 and 454 1-piece rear main seal)

12561217

1991-up

  • Outside diameter: 14"
  • Crank flange bolt pattern: 3.580"
  • Clutch diameter: 11.500"
  • Starter ring gear teeth: 168
  • 427 crate engine production internally balanced (.100" thick)

471598

1965-up

  • Outside diameter: 14"
  • Crank flange bolt pattern: 3.580"
  • Clutch diameter: 10.750"; 11.500"
  • Starter ring gear teeth: 168
  • For internally balanced engines
  • Use with 572/620 crate engine
  • Has dual-converter pattern (.120" thick)

14001992

1970-1990

  • Outside diameter: 14"
  • Crank flange bolt pattern: 3.580"
  • Clutch diameter: 11.500"
  • Starter ring gear teeth: 168
  • For externally balanced 454 Mark-IV 2-piece rear main seal engines

BOLTS AND DOWELS

12337973

Flywheel Bolt

  • Fits all Chevy Small-Block V-8, Big-Block V-8, and 90° V-6 engines
  • Sold individually; six required per engine

10046031

Flywheel Dowel (Big-Block) 

  • Highly recommended for all high-performance and competition Big-Block engines

1453658

Bellhousing Dowel and Clutch Housing/Transmission Dowel (Big-Block) 

  • Use with Big-Block engine
  • Sold individually; two required per engine

3727207

Flexplate Bolt 

  • Fits all Chevy Small-Block V-8, Big-Block V-8, and 90° V-6 engines
  • Sold individually; six required per engine

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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.