ok bros a friend of mine who lives too damn far away for me to travel and look at his vehicle has a problem.heres the low down.his small block chevy race engine ,high compression,roller ,etc is smoking like out of the blue,he had it re rung last fall/no major high rpm passes....crate world motor about 2 years old ...he said his idleing has jumped up to 1500 and it usually goes about 1100..i cant understand the smoke deal though/although he did run some pump fuel in it at low rpms cuz blue/purple fuel not available..could he have pulled rings out of it or is this something from unleaded fuel.?will this smoke pass..i never ran shit fuel in a high comp motor so im not sure.thanx.