What year 235-261 engine are you working on ? Is the casting number off your old cap and if not, where did you get it from ? If you are working on a 1953 Powerglide engine,a 1954 or 1955 first series truck 235 or 261 or Corvette 235 i have that cap according to the 1961 Chevy master parts catalog.Mine is cast with the number #3836538 and does have the 3/8 x 16 NC inch threaded hole,has the letter R and is for the thrust bearing.--No 1956 or newer engine has that hole because it is no longer needed due to a change in the oil pump design.I can get most any part you need if i have enough information to go on.
EvilDr235
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Two types of people drive old cars.Rich people because they want to and poor people because they have to.
Remember EvilDr235 has a cure for Your sixness.
