compression test shows good. Your valves, pistons and rings are in good condition (meaning they are sealing well). If u have a vac/boost gauge, at idle ur gauge should read 18-22 in hg which also tell u how well ur internal are sealing. My new engine stared off idling at 10in hg and now its at 19in hg bc its had time for the rings to seat. kinda freaked me out at first bc ive built a few mtrs in my time but this was the very first one and has the biggest ring gap ive ever done.