Oil Galley plugs at Camshaft

Welp, I can tell you I never use them. The engine in my car doesn't have them. The R block deal I'm doing next won't have them. Any chance your plate was junk? I've done it with the OE plate, a gear drive and the magnum tensioner plate and never had a low oil pressure issue.

How low was the pressure? You leave a 3/8 plug out and you still have some pressure. How much could possibly leak by the plate?

I had to pull the engine 4 times before finding the problem... I had to make my own priming shaft in welding class as they were not available back then... When I tried the priming shaft, it held and no oil came out... When my brother came in and saw the priming shaft on the drill in the engine, he just had to try it and a jet of oil came squirting out 6 feet and almost hit me... I told him to do that again and another jet came squirting out...

After that experience, I always make sure that they are installed...