A buddy gave me an unused HD type one oil pump, but i find that the mounting holes are too small for the studs in my T4 case. Is it ok to just drill out the holes in the pump and cover?
No, sounds like you have a pump made for a 40hp case with 6mm studs. Post a pic, is the body iron or aluminum? gear size? who made it?
Honestly maybe it could work but I'd be very careful of the depth, clearance of the cam and the fit in the bore.
A lot of those no name pumps are cheap Chinese junk.
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