Does anyone know anything about valve lash. I've been trying to get my adjustment right and Im having trouble. Just about everything I've read is a little different. Some say to adjust until the pushrod can't be turned and lock. And some say you should add 1/4 to 1/2 turn beyond that. I've tried the zero lash and 1/4 turn but that isn't right either and this is a hot motor. This is starting to drive me nuts. The car has power but there is studder in acceleration and an occasional exhaust backfire.