The S&S crankcase oil passage drilling jig is used to perform crankcase drilling modifications when installing an S&S oil pump assembly on early Big Twin crankcases. Made of hardened steel for durability, this fixture enables the builder to do four modifications.
Drill jig is used to drill:
Primary chain oil supply passage from the breather valve gear cavity to the back side of the oil pump body on late generator and early alternator crankcases
Pressure relief passage from behind the main oil pressure valve to the gear cavity on alternator crankcases
Crankshaft and main bearings supply passage on generator crankcases
Crankshaft and main bearings supply passage on early alternator crankcases
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Questions & Answers
what are all the holes for on the jig and where do they go . how many holes do I need to drill on a 1973 shovel head with belt drive
The largest holes are used for securing the jig to the crankcase itself. In the case of a '73 Shovelhead engine, you'll need to drill a pressure relief valve hole on the same face that the oil pump is affixed. Because the hole needs to be drilled at an oblique angle, the jig is a really nice tool to have for the job and leaves no doubt that the hole's position and angle are correct.