The Proform 67606 is a heavy-duty crankshaft turning tool designed specifically for GM LS-series engines. It provides a secure way to manually rotate the crankshaft during engine assembly, timing work, or other procedures—especially when the harmonic balancer is removed.

Key Features:

• Fits GM LS-series engines
• Attaches to the crankshaft via oil pump drive lug splines
• Allows manual rotation of the crank using a 1/2" drive ratchet or breaker bar
• Machined from high-strength steel for durability and long service life
• Features provisions for mounting a degree wheel—ideal for camshaft degreeing and precise timing adjustments
• Smooth fit ensures safe use without damaging crank surfaces

Specifications:

• Drive Size: 1/2" square
• Material: High-strength steel
• Finish: Black oxide or phosphate (varies by batch)
• Application: GM LS-series engines only

Applications:
Perfect for professional engine builders and LS enthusiasts, this tool is essential when building, inspecting, or tuning GM LS engines. It ensures smooth and controlled rotation of the crankshaft for precise mechanical work.