How much is acceptable to have, engine didn’t smoke or any issues. Been sitting in my house garage for 25 years removed to put in the Lil Red so I pulled heads to clean out the ports (mice got in there) and noticed the ridge, maybe catch a fingernail on it, thought it was just carbon at first. 1974 stock cast crank engine.

Last edited by cudaman1969; 05/26/23 01:37 PM.