Crank Pin Drill Fixture Kit

The ATI Performance Crank Pin Drill Fixture Kit (SKU ATI918993) is a precision engine modification tool designed for GM LS-series engine builders and experienced mechanics who need to enlarge or modify crank pin bore diameters during high-performance engine assembly. This specialized fixture kit addresses a critical need in stroker and high-RPM LS builds where crank pin sizing directly impacts crankshaft integrity, oil delivery, and rod bearing clearance. Whether you're building a track-focused engine, custom racing platform, or extreme performance street motor, this fixture ensures accurate, repeatable drilling without deflection or misalignment that could compromise crankshaft durability.

Constructed from hardened steel with black oxide finish, the Crank Pin Drill Fixture Kit provides rigid centering and support during drilling operations, preventing bit walk and ensuring perpendicular bore alignment on the crankshaft's rotating assembly. The black oxide coating resists corrosion and wear during repeated use, while the fixture's precision machining guarantees that each drill operation maintains strict geometric tolerances essential for proper oil distribution through the crank's internal passages. Weighing just 1.8 lbs and measuring 3.4 x 3.3 x 6.7 inches, the kit combines portability with substantial clamping force, allowing single-operator use in both professional shops and dedicated home garages equipped with quality drill presses or CNC equipment.

This fixture kit is indispensable for LS engine enthusiasts undertaking extensive crankshaft modifications, particularly those upgrading to larger displacement stroker assemblies or implementing aftermarket crank designs requiring custom oil hole sizing. Professional engine builders, machine shops specializing in LS performance work, and serious DIY builders tackling complete engine rebuilds will find this tool essential for maintaining dimensional accuracy and repeatable results across multiple engine builds. Proper use of this fixture eliminates guesswork and potential catastrophic failures caused by misaligned crank pin drilling, making it a worthwhile investment for anyone committed to reliable, high-horsepower LS-series engine development.