A .030" hole drains off no oil pressure.
All three plugs you ask about are 3/8 NPT, but the front plugs can not be standard depth / lenght as they will block off oil feed holes .
To deal with this you can cut Brass plugs shorter and then tap the passages deeper, or order shorter steel plugs from Grainger or the like!
A hardened steel plug used for the rear will be a bitch to drill unless you anneal it first, then you can drill it with a big bit untill you have .050" wall thickness left and then blow thru it with a .030" bit, or you can just use a aluminum plug and make it easy.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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