stumped

[timracer44]

I'm running a 2550,d port head,620 roller cam, efi intake Holley 4412 carb. My problem is number 4 cylinder is running real rich. The other 3 cylinders are fine. Ive change plug, wires, check valves. Still #4 plug soaked in fuel. Any suggestion?

[84Dave]

Check the #4 cylinder contact in the distributor cap. Warm the engine & run a compression check. See if #4 may have a problem, possibly oil in the cylinder that dilutes the mixture causing misfire, due to the ring package? I.E. some of the 'soaked' plug may be oil? Does the engine appear to 'miss' under power? Anything about a spacer under the carb or the runner in the manifold leading to #4 that may cause excessive fuel to 'favor' #4? -Dave-

[wildmanracer3]

We had a problem like that with our super late model, ours was the intake gasket was sucked out on the port so check that also.