Hello
a couple of years ago my father bought a modified MOPAR 360 that had a slow rpm drop and when i asked him about it he had no idea what had been done to it, so i did a little bit of research (didn't really find anything)
could a heavier crankshaft, camshaft or the valve tuning be the main cause of the slow RPM drop?
thanks
I forgot to mention its a carbureted 360 from the early 70s
I forgot to mention its a carbureted 360 from the early 70s
When does the RPM drop occur? Starting at high idle speed from cold and then dropping down as the engine warms up and the choke opens is normal. If it's occurring under other conditions it could be a carb problem. Also, if that engine still has its factory complement of crude vacuum-operated emissions gadgetry that can certainly cause idling issues as those devices and vacuum lines fail.
I doubt it has anything to do with the crank, cam, or valves. You'd have much more severe problems if that engine had those kind of internal issues.
The culprit could be the Idle Air Control (IAC) valve-clogged up or needs replacing.
I may be wrong about this but I'm fairly certain that early 70s Mopars didn't use an IAC valve with the carburetor.
