This is a 168-tooth steel flywheel for internally balanced Big Block Chevy engines. It is designed for blocks that use a 1-piece rear main seal and provides the ring gear for the starter and the mounting surface for a manual clutch.
Specifications:
- Component: flywheel
- Ring gear: 168 tooth
- Material: steel
- Balance: internal (neutral) balance
- Rear main seal: 1-piece seal
- Sold: each
- Part number: 12582964
Applications:
- Internally balanced Big Block Chevy engines with a 1-piece rear main seal (1991 and later)
FAQ
How many teeth does this flywheel have?
It has a 168-tooth ring gear, which matches the larger starter pattern used on many Big Block Chevy applications.
Is it for internal or external balance?
It is machined for internally balanced (neutral balance) Big Block Chevy engines.
Which rear main seal does it suit?
It is designed for Big Block Chevy blocks that use the 1-piece rear main seal, which GM introduced on later engines.
What material is it made from?
The flywheel is steel for durability behind a manual clutch.

