All Small Six Vacuum port thread size

[65 Mustang]

Hello Everyone. Sorry to bother with such a mundane question, but does anyone know off hand the thread size for the vacuum port in the intake manifold (200 six)? I need to plug it. Also, should I put some sort of sealer around the threads when I do to prevent possible vacuum leak? Thanks.

 

[TrickSix]

1/4 pipe thread. A soft brass plug might not need any sealer, but a small amount of pipe joint sealer or teflon tape probably wouldn't hurt.

 

[Alkraut]

Agreed, 1/4 NPT female. I "chased" my threads with the correct threading tap to clean up, then vacuumed any debris from hole.

 

[65 Mustang]

Ok. Thanks for the info!