The BTR Lower Timing Gear is a crankshaft timing gear built for standard single-roller, wet-sump Gen III and Gen IV LS engines. It offers benefits over the Chevrolet Performance P/N 12556582, including reduced "chain slop" that is common with the factory lower gear.
- Part Number: BTR56582 (cross-reference to GM 12556582)
- Application: Gen III / Gen IV LS engines, standard single roller, wet sump
- Benefit: Reduces chain slop compared to the factory lower gear
FAQ
What engines fit the BTR56582 lower timing gear?
It fits all standard single roller, wet sump Gen III and Gen IV LS engines.
How does the BTR56582 improve on the factory GM gear?
It offers benefits over the Chevrolet Performance P/N 12556582, including eliminating the "chain slop" common with the factory lower gear.
Does the BTR56582 replace the OEM lower timing gear one-for-one?
Yes, it is designed as a direct fit replacement for wet sump Gen III/Gen IV LS applications using GM P/N 12556582.

