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it's 14 MM & most if not all are that size & a few have 18MM adapters(which you wont need). I would suggest you get a fairly good one at your parts house that will continue to give accurate readings years to come. Compression testing is somewhat basic & people have gotten away from them somewhat but they have saved me lots of times when my mind wanted to get away from the K.I.S.S. principle.



Thanks Robert.

I'll post the findings tomorrow evening with, hopefully, a consistant reading cylinder to cylinder. If there is a substantial difference though and if the concensus is that it is the head gaskets, I will be leaning on you guys once again for more guidance.

But then the question arises, what caused it to happen in the first place.