[craign]

Morrie,

I had a similar problem when I fisrt bought my 69. Low compression on 2 cylinders. The car had sat for over 2 years before I got it. the engine had less than 10k on the rebuild.

At the suggestion of a Porsche mechanic I did an oil change and added Marvel Mystery oil to it. I then got to run the snot out of it, getting as hot as you can, and low and behold my compression came up to the 170 range.

Why.....apparently when these, or any car, sit for extended periods a form of "varnish" can build up on your rings and seals. Marvel Mystery oil is a solvent based additive that cleans that junk off.

It was a cheap way to find out I didn't need a rebuild.

Craig