1G Weird compression test results

[blujeans]

Just did a compression test today on my 1G, engine was at operating temp. Below are my results and pics of them:

Cylinder 4: 130 PSI
Cylinder 3: 150 PSI
Cylinder 2: ~133 PSI
Cylinder 1: ~127 PSI (forgot to take pic of result)

Any reason why cylinder 3 would be so high while the others are lower? I didn't do a wet test yet but I plan on doing it again soon to test my rings. I know one of the previous owners rebuilt the head a couple years before I bought the car, if that helps at all.

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[ist dwa]

Poor valve sealing is my guess.

 

[pauleyman]

Run a leakdown test and you will likely find the cause.

 

[motomattx]

How many times did you do the test? did you open the throttle all the way and crank until the needle on the gauge quit going up? if not do the test again and see what you get.

 

[blujeans]

It was the first time doing this test, and yes I did both of those. I plan on doing a leakdown test with a friend of mine in 2-3 weeks so hopefully then I'll be able to narrow down the possible causes easier.