Leaking oil gallery plug

I have a new build for my 67 comet .I got my camshaft broken in heads reworked .It sounds good runs good (in the back yard ).And I have an oil leak .Suspecting my rear main I pulled my engine and found oil coming from the drivers side oil gallery plug .I primed it with my drill and it is leaking .Another plug (used) some pipe dope primed it again NO leak .Well I installed my engine and it still leaks.Pulling the flex plate oil appears to be coming from the same place .Although priming the pump this time there is no oil coming from this plug.So I removed the plug and screwed it back in .It has some wiggle before you really tighten it down.The threads aren't striped and before this build I had no leakage on this engine .I am guessing when ever the oil gets hot it starts to leak .I have some old oil gallery plugs and miced several most were a consistent size only one miced .001 smaller than the rest .My plan today is to purchase some new plugs try using Teflon tape instead of pipe dope and check the oil pan and rear main seal .I don't believe either is really leaking but since I cant get this plug to leak cold what else is there to check? Is there an oversize plug? I know these aren't pipe thread from memory isn't this called a J thread ? My local track opens this weekend I am really anxious to see how my RM camshaft runs compared to the reed I had in there .Any thoughts or solutions will be appreciated .PS the cam plug is dry the passenger side plug is dry and nothing else appears wet from oil .AND I didn't tighten the plug so tight that it would be difficult to remove .But it was tight .Doug

you might have the wrong plug in it, Was it flat? Or did it have a point? If it doesnt have about 3 threads sticking out its prob a bad plug,or wrong TYPE.

DONT USE TAPE

BOSS 429 wrote:

DONT USE TAPE

Do you use the liquid teflon pipe thread sealant? thx

I use the black rtv on mine for tread sealant the tread tape if any get in the oil it can stop a oil passage up or lock the oil pump up

jasonf wrote:

BOSS 429 wrote:

DONT USE TAPE

Do you use the liquid teflon pipe thread sealant? thx

paste type,tube,or jar. tape can cause all kinds of problems

The J thread is the front "pointed" type plugs aren't they ??

I am afraid I was using the wrong plug .I had ones for the front oil gallery with the points and j thread .That is probably why they were loose .I went by the machine shop and got the correct ones from my machinist Lee.Nothing found at the oil pan or rear main seal .Everything is headed back home .I will post again in a couple days thank for the help .And I did leave out the Teflon tape ! Doug

manofmerc wrote:I am afraid I was using the wrong plug .I had ones for the front oil gallery with the points and j thread .That is probably why they were loose .I went by the machine shop and got the correct ones from my machinist Lee.Nothing  found at the oil pan or rear main seal .Everything is headed back home .I will post again in a co
uple days thank for the help .And I did leave out the Teflon tape ! Doug

I was betting on the wrong plug, least it was an easy fix

I did a tear down of this engine probably a year before I re assembled it and lost the oil plugs that came with it .Being lazy to go pick up some new ones I have lots of the old tapered plugs sitting around and just forgot the front plugs were different from the rear .This am will tell the tale .This is 466 with edelbrock heads victor intake flat top pistons scat rods .My old cam was 589-603 sft .This cam is 668-649 sft kinda curious to see what my comet will do .Thanks all

I did a tear down of this engine probably a year before I re assembled it and lost the oil plugs that came with it .Being lazy to go pick up some new ones I have lots of the old tapered plugs sitting around and just forgot the front plugs were different from the rear .This am will tell the tale .This is 466 with edelbrock heads victor intake flat top pistons scat rods .My old cam was 589-603 sft .This cam is 668-649 sft kinda curious to see what my comet will do .Thanks all