On LS1, LS6 & LS2 engines the crankshaft and factory harmonic balancer does not use a keyway to positively locate and lock the balancer. In high horsepower applications the pulley can spin on the crankshaft sometimes so severely that the crankshaft and balancer can be damaged. The ATI crankshaft pin drill fixture kit is designed to pin the crankshaft for high-rpm, supercharged, turbocharged, or other high-horsepower engines. They include a billet aluminum black-anodized drill fixture, a hardened 11/64 in. drill bit, an alignment tool, and pins for the crankshaft.
Drill Pin Fixture Inside Diameter | 1.438"
Drill Pin Fixture Material | Steel
Included Drill Pin Fixture Drill Bit Size 11/64"
FITMENT | Chevrolet V8 5.7L/350 Small Block Gen III - IV LS Based Engines from 1997-2004