These OSS-12674582 LS harmonic balancer have been removed from brand new, never ran GM LS3 crate engines. Originally used on LS3 Corvette engines. Standard 1.50” (37mm) offset.
This balancer is recommended for use with Chevrolet Performance LS serpentine drive systems FEAD. Replaces P/N 12620556 and 12635649.
Use with P/N 12557840 balancer bolt.
A smooth-running engine depends on an effective balancer or torsional damper. Chevrolet Performance dampers not only help LS engines run smoothly, they can extend engine life.