To plug oil hole to head...

[Anlushac11]

...What size threaded pipe plug do i need?

I want to use oil through lifters so I can run Small Black Ford hi rev anti pump up lifters.

 

[mannella]

There are no pipe threads in the head just a hole that the #11 head bolt goes into. I think there are pictures in the sticky's under the cleaning of he rocker arm's and shaft.

 

[Does10s]

I don't remember the exact size unfortunately. But it was just large enough that i didn't need to drill the hole larger. Just had to tap it.

The only concern is that you get the shavings out, and you get the plug in deep enough to be slightly below the deck. Although with a normal head gasket you can have the plug above the deck surface by up to .030" and probably still be OK.

Later,
Will

 

[falcon1963]

This is a copy from a post using search.
Tap that oil supply orifice on the block with a 3/8-16 tap & install a set screw which will act as a plug to keep line oil pressure out of that area & not reach the headgasket seal area.Falcon Man

 

[Bayrunner]

Please remember that pipe threads are different from machinist threads.
To prevent seapage, use pipe thread tap and get a 1/4 pipe plug from a decent hardware supply store. I actually went to Eastern Steel Fasteners and for .40cents picked up a stainles plug which has an allen recess head on it.

Cheers

 

[falcon1963]

Please remember that pipe threads are different from machinist threads.
To prevent seapage, use pipe thread tap and get a 1/4 pipe plug from a decent hardware supply store. I actually went to Eastern Steel Fasteners and for .40cents picked up a stainles plug which has an allen recess head on it.

Cheers

Bayrunner correct me if i'm wrong.
I measured a spare block oil supply to the rocker arms on the block deck & it is close to .312-5/16"
The drill size for a 3/8-16 tap is .312"
The drill size for a 1/8" pipe tap is 11/32 or .343" thus you would have to drill the .312" to .343" for a 1/8" pipe plug.
If you use a 1/4" pipe plug the drill size to tap is 7/16"
Why would you want to drill an existing .312" hole to 7/16" to use a 1/4" pipe plug????
The 1/8" pipe plug still requires you drill the block to .343" to tap, thus creating more metal chips.
I agree the pipe plug would provide a better seal, but at the expense of more metal chips to cleanup.
I would not run the risk of enlarging a passage unless there is plenty of room before hitting the coolant area.
If properly sealed i see no reason to drill the block for the 1/8" pipe plug vs the 3/8-16" set screw. Falcon Man

 

[Bayrunner]

sorry, you are right on the size. I used the 1/4 size to fill in water passage holes for the crossflow swap

cheers