Any one interested in the oiling mods I did?

gregcon said
Yes, I meant the old oil filter hole. It's a 3/4-16 thread which is nothing too exotic. But, that is the same size as 8AN, so an ORB fitting (plug) goes right in. The chamfer 'could' leak but I think it won't as it looks pretty consistent.

Here are the cutting tools...a 23/32 end mill (or you can use a 23/32 drill) and two taps. The first tap is a Butterfield interrupted thread version....painfully expensive but the quality of the threads is excellent. The interrupted thread results in a tap that only takes about 1/2 the force to turn...nice. Then, a modified 'normal' TRW tap...the end is cut off by about 4-5 threads. This allows you to tap to the proper depth without the nose of the tap hitting the block first.

View attachment 1715574746

I did not have the luxury of a milling machine. I cut the threads in my block with a hand drill and hand tools. You need some serious leverage to turn a standard 1/2 inch pipe tap by hand. I agree you need a cut off tap to get the threads right in a shallow hole. You appear to have a machining background as do I. Glad to see you are handy.
Nice work. I always say that to be in this hobby, sometimes you have to improvise and use what you have available to you.
You have to Mcgiver it lol.