Ford SB Galley Plugs - Thread Size

[Ron Earp]

I've got two plugs to put in the side of my block but I'm out of plugs. What size thead are they? One is up high on the 1-4 bank at the back and appears to go into the cam area, the other is around the motor mount on the 1-4 bank. I don't remember them being a NPT thread and type.

Ron

[Jac Mac]

Originally Posted by Ron Earp

I've got two plugs to put in the side of my block but I'm out of plugs. What size thead are they? One is up high on the 1-4 bank at the back and appears to go into the cam area, the other is around the motor mount on the 1-4 bank. I don't remember them being a NPT thread and type.

Ron

Try a 7/16 UNC bolt or possibly 1/2 UNC, if the bolt screws in at least 4 turns & its a snug fit & not a taper thread they are just accessory boss's. If they are 1/4 npt then they are either coolant drains from the block or oil gallerys.

Jac Mac

[Rick]

They are either 1/4" or 3/8" National pipe thread.