- For Chevrolet Small Block V8, 90 degree V6 and 4 Cyl., and Ford 4.6L
- 1.255 inch ID with 3/16 inch Keyway
- Specially designed 1/2 inch drive socket allows rotation of engine assembly
- Knurled retaining nut that holds degree wheel in place
- Can be loosened while on crank snout so that wheel can be turned independent of the engine when finding TDC
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