[BK911]

At a recent DE event, my car ran awesome and gave no indication anything was wrong, but I was told my engine was smoking a little bit. So I did a compression check when I got home and found 160 – 165 across the board except #4 was 100. I couldn’t find my leak down fixture, so I set #4 at TDC and pressurized it to 100 psi to listen for a leak. I couldn’t hear anything. Then I did a wet compression check on #4 and got 120. A little bit better, but still not good enough.

Any ideas on what it could be? The engine has about 3k miles on a complete rebuild from a reputable shop. Everything is new except the pistons and cylinders. She seems to have poor compression but good leakdown. I am going to pull the valve covers and look for a broken head stud. Is there anything else I could do? Would you run it as is or tear it apart?

Thanks!
BK