[Walt Fricke]

Juan

Had you not had the missed shift, I suspect you and most others would not be overly concerned with these numbers. But you did, and I'd worry also. Sometimes a bent valve will sort of true itself with use. I had exhausts which did that. The stem was noticeably S shaped after a further year of street driving post missed shift. That damaged the guides, which sloted to accommodate the bend and whatnot. In addition to the possibility of burning a seat ("just" burning a valve is not, by itself, so bad long term, as bent valves have to be replaced, but that's simpler than replacing a seat), the worst disaster is having the head of the valve break off. That blows the motor up. Since yours is a race motor, I think more worry is in order, even if a slight tweak leading to a small leak may not have compromised the valve that much.

So I'd spend some more time listening to the air leaking. You can skip the gauge parts, since you have your measurements, and now just need air under pressure. Maybe alternate between #4 and #6, the better to differentiate between one which looks like the best, and the worrisome one. You need to calibrate your ear, so to speak. Do you have a long small hose you can put in your ear and up the tailpipe as well as down the intake past the butterfly, and into the case?

My experience with low leakages has been that they are past the rings. Even with a nominal 0 percent leakage (Total Seal rings) I always hear some air sound in the case. Which doesn't mean that is your situation, of course.

The exhausts seem the most likely to strike a piston (and get bent) when missing a shift. Do your heads have screw plugged air injector holes in the exhaust ports? That might make a good listening location if the plugs aren't hard to screw out.

If taking another listen still leaves you uncertain, with some extra effort you could pull your right side exhaust header, pressurize the cylinder, and spray soapy water up into the exhaust port and look for bubbles. Again, probably a good idea to do it to more than just your problem child so you have a comparison. When I have bent an exhaust I've known it without having to go that far, but it should work.

Walt