Originally Posted by Sniper
That big a spread in the compression numbers tells us that you have mechanical issues.


Yes, I know that. Most likely rings from fuel wash (owner tried way too many to fire it with no spark) and little use over the last 10 years. It still should idle, even if rough, at 10 before. I've had blown head gaskets idle better than this, including a 440 that blew between two cylinders.