So if I understand this thread correctly, this "cap" cannot be installed from the top of the engine! It must be installed from the bottom? I am having the same problem, on a 340. No one has been able to figure out why the lifters rattle.
Ok now we are confused. 68 gts said you can put this plug in from the top. Who is correct?
Sorry if I confused the issue, that drive in welsh plug, cap, needs to be installed from the bottom with the #5 main cap off the block I believe, I've never had to reinstall one in any SB Mopar I've ever worked on
It makes all the oil from the oil pump go through the oil filter instead of going straight up that oil passage directly to right side lifter
Ah I told him no way as this was a complete rebuilt eng with all new bearings and oil pump. Anyway I pulled the pan and put a jug of oil up to the oil pump screen and ran the pump with a drill. Then I saw all this oil leaking internally near the dist running down past the mains onto the ground as they had forgot to put that oil galley plug in near the rear of the eng in the lifter galley. Sounds like the same one you had missing as this you can see when you take the dist out. Since then I have seen this a few other times. Ron