Spark plug adapter

[cederholm]

I need an adapter for my compression tester to fit the larger sparkplug holes. Can any one tell me the specs that I need to look for?

A google search provide the wrong spec and I ended up buying one the doesn't fit. ...should have asked you guys first.


Thanks!

 

[Y-Blockhead]

Snyders has a spark plug adapter that I use with my Snap-On compression tester. https://www.snydersantiqueauto.com/searchm.htm?type=merged&sterm=&searcht=a-12405-adp But like numerous things these days, I see they are "Temporarily Out of stock".

 

[ArtimusGordon]

I punch out the porcelain center of an OLD spark plug. I us a compression tester with a rubber tip.

 

[alexiskai]

Bert's claims to have them.
https://modelastore.com/index.php?route=product/product&product_id=12635

 

[cederholm]

Good idea - if I had an old sparkplug. I'll keep that in mind.

I punch out the porcelain center of an OLD spark plug. I us a compression tester with a rubber tip.

 

[cederholm]

Thanks all - but does anyone know the size/thread of the hole?

 

[katy]

7/8"-18