hi everybody, I have a new noise in my 1967 gmc camper cruiser. it has a 351 v6 engine and the new noise sounds like blow by, but I cant seem to fiqure it out. it maybe exhaust manifold or something with the intake. if I put my hand near the intake manifold and the carb on the passenger side I can hear blow by and feel pressure coming from somewhere?? could it have something to do with the exhaust flapper ? any ideas?
