Diagnostic question

Depends on how bent they are. Here’s a good one that some guys don’t think of.

I’ve seen valves so bent you’d think they wouldn’t seal, but if you put enough spring load on them, they will seal up.

So it’s possible your valves are bent a bit, but even 120 pounds of seat old can partially seal up a bent valve.

That’s just an FYI because I’ve seen it many times.

Thanks all for the replies. I'd always considered 10% acceptable, and the only concession I'll make is that this a 100% stock engine with stock rings. It's mileage is unknown.

I have extra heads and some hot rod valve springs that I got from toolman. I guess it might be worth pulling heads.