Navarro 8ba Heads

[tubman]

Originally Posted by Tim Ayers

It shouldn't be "hanging out" but it also shouldn't be tuck deep inside the threads of the head. If they are off the engine, you can get spark plug spacers to help you select the correct one so you can use common 3/4" reach plugs.

Now that I say that, are you sure they weren't reworked for 3/4" plugs? New Edlebrocks are recast this way.

A minor point, but wasn't it the Offenhauser heads that have been recently changed to use the longer plugs? There was an extended discussion on this board several years ago that came to the conclusion that there was no proper length plug currently available for Offenhauser heads and spacers were needed. I have a set of never-been-installed Offenhauser 8BA heads I bought new in the mid-90's that confirm this. The first set of finned heads I ever bought was a set of Edelbrock's in 1961, and they took a Champion "N" series plug even back then. I just bought a set of used Edelbrock's on eBay, and they take 3/4" reach plugs. I know; I measured them yesterday to determine which Time-Sert set I need to fix a bad plug hole. Jeez, are those things (Time-Serts) expensive.