Quote:
Originally Posted by Rudolph
hello, I am doing the mod of installing a plug inbtween the oil galleries but I want to drill out both the side and top threaded holes for bigger fittings, what’s a good size to go to? Might be hard to go much bigger on the raised boss one.
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Not sure what the top and side threaded holes refers to. To me, they are both on top, the original oil pressure gauge outlet (2 outlets, one vertical and one horizonal) and the one you drill nearer to the center on the engine.
If you are referring to the two different holes drilled into the original oil pressure gauge outlet, they both go into the same passageway and only one would connect to an external full flow or 95% flow filter. The second of the pair is for an oil pressure gauge fitting and there would be no reason to enlarge it.