Kicker cover filler hole threads

[64duo]

I was looking a long time to try and figure out the correct threads on my pig-nose kicker cover fill hole. The correct tap is 7/8" - 18, just in case anyone is looking.

[Cotten]

Its also the same thread as the speedo drives (where the cable screws on), and very early sparkplugs.

.....Cotten

[Guest]

Is 7/8"- 18 the same thread as the timer hole plug on the cases? My timer hole threads are shot and now that my motor is down I want to fix the problem. What is the recommended route, helicoil or the oversized plugs?

King

[Cotten]

King!

It's foolish for me to trust my feeble memory here at home with no references at hand, but I think your timing hole plug should be SAE 5/8'-18, and helicoils are readily available.

...Cotten