Being that it already has an existing fill port, why not drill and tap with an 1/8" pipe tap for an 1/8" allen key flush pipe plug far enough forward in the casting, and off to the side so its not lined up with any of the bolt holes or close to the back to lessen any stress. I marked in the pic where i think it would be a good idea for a drain plug. Its far enough forward that it wont weaken the casting. Its between 2 bolts and not lined up directly forward of one. 1/8" pipe plug is a small hole, so it shouldent weaken the case much if any. I wouldent recommend this for high HP applications but 400-450 application i would think it would be fine. What do any of you think about this?
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