I have an exhaust valve that sticks open. I've got less than 200 miles on this hemi I had built and I was running it hard dialing in the carb when it starting huffing and running like crap. I limped home and discovered one of the exhaust valves was hanging open about 1/8" when it should be closed. I looked inside the cylinder and there is no sign of the valve hitting the piston.

What's also strange is about 50 miles earlier I decided to do a compression check and none of the cylinders would hold pressure. But since I just had the engine built I dismissed it as a faulty compression gauge.

I'm in the precoess of pulling the heads but I was wondering if any of you guys that know engines can tell me what to look for? Maybe the wrong kind of oil seals causing the stems to run dry? Is there something I sould be looking for or be careful of?

Thanks