I measured the OEM sockets and they were M6 x 18mm length.
Will there be an issue using 20mm length? (https://uploads.tapatalk-cdn.com/20190626/7d2577512bdf122f47238c4f9f38368a.jpg)
I'd say no problem.
Should be easy enough to check the depth of the hole with a piece of wire.
Quote from: Ddan on June 26, 2019, 11:20:12 AMShould be easy enough to check the depth of the hole with a piece of wire.
They're already installed. Of more concern is the extra 2mm potentially being an issue (e.g. rubbing on something it shouldn't ).
What vintage are those heads?
Engine is stock AFAIK. 1997.