Same car as in my other posts: '75 duster with a '73 400 big block 4 barrel/727 auto/8.75" combo with a cam (don't know the specs) and new mopar performance electronic ignition distributor with mechanical and vaccuum advance. Runs smooth since I installed the new distributor, but there is an intermitent kind of "pop" noise that comes from the driver's side cylinder bank occasionally. It is not rythmic so I am thinking a misfire, maybe? The engine runs smooth though, so at first I just chalked the noise up to the crappy, leaky exhaust system. However, the other day I removed said exhaust at the manifolds and couldn't resist the urge to fire it up with no pipes. The noise is very noticeable now and when it does it a small flame spits out of the driver's side exhasut manifold. In addition, after I rev the engine and it is on its way down the rpm range, it pops loudly and blows considerably louder flames out of the manifold. I have been told that this is normal, but I am skeptical. Also, the engine smokes just a little, I'm thinking either worn rings or valves. Could this maybe be linked to the "misfire" I'm hearning? Could I be wrong and the noise could be something besides a misfire? Any advice would be appreciated.
- posted
17 years ago