[screamingchief]

Did a timing chain jump?

Ditto this.

That or the valves are'nt adjusted right or are'nt sealing very effectively.

Do a leakdown test,or at the very least take the valve out of the compression tester rig and pump some air into a cylinder and listen to where it's leaking from.

Even cold the numbers should be way higher.

HTH.

[86t-type]

O.K i think i found my problem. It may be my Comp. tester. I took out the shrader valve and did the test(of course it will not hold the psi in the guage) However it went up to 140 psi. Also keep in mind this is a good running motor. I am just assesing it's condition since the car is new to me.
Even though the guage is not holding the psi the fact i am getting the 140 psi is a good thing.
What do you guys think?

John

[Ollie]

With one cylinder at 135 and one at 145, 140 psi is good for a motor with 80K.

[screamingchief]

Yeah,140 would be about what I'd expect for a low comp 400 that has some miles under it's belt.

I would replace the schrader valve in the test rig with a new one and retest,as stated testing the car warm is prefered vs. testing it cold.

Though a leakdown test is still a much more accurate assesment of engine condition.