Compression tester for 13/16 plugs, or adapter from 18mm???

[Geff McCarthy]

I have a primitive tester with 13/16 hex. NO auto store, or on line, has any tester for my 63 400. Any leads as to where to buy? Is there an adapter from 18mm, the largest modern, to our old 13/16. I have searched on line....!

 

[493 Mike]

I have a primitive tester with 13/16 hex. NO auto store, or on line, has any tester for my 63 400. Any leads as to where to buy? Is there an adapter from 18mm, the largest modern, to our old 13/16. I have searched on line....!

Harbor Freight has several.
Mike

 

[pnora]

I have a primitive tester with 13/16 hex. NO auto store, or on line, has any tester for my 63 400. Any leads as to where to buy? Is there an adapter from 18mm, the largest modern, to our old 13/16. I have searched on line....!

The adapter you need is 14mm. There is no 13/16 adapter. The 14mm works for a 13/16 hex, 3/4 hex, 5/8 hex. https://www.harborfreight.com/compression-test-kit-8-piece-62638.html

 

[Geff McCarthy]

Thanks to you both!!!