Recent content by burl

The original plug looks like it was 16mm or 5/8 fine.Both threads are very close to the same.I couldn't find and plugs that fit that size so I was thinking about changing all of them to 14mm which is a pretty standard plug.

has anybody ever repaired the spark plug threads in a head ?Just wondering what was used and how it was done.I have been looking at the thread sert inserts instead of helicoils

Jim, already checked it with tap,seems like its 16mm or 5/8-18

I don't think this one was cut as we checked it to another one just like it.The depth to the combustion chambers is exactly the same.For some reason the previous owner removed the weiand lettering,must not wanted anybody to know what they were running.Just trying to find out what the plug size...

So im looking at purchasing an old weiand head.Two of the spark plug holes have been repaired and changed to 14mm.The other two are either 16mm x 1.5 or 5/8 18.Anybody know what size there are supposed to be ?I would like to make all of the plug holes the same.Just checking to see if anybody has...