That would be the first spark plug / cylinder all the way up front
On the 4.2 inline 6, the 4th cylinder from the front of the engine is number 4. The engine is a coil on plug, the spark plug is located under the coil in the center of the valve cover.
Bad distributor cap, plug wire, or spark plug.
The spark plug gap for a 1949 Dodge 230 Inline 6 cylinder engine should be set at .025 inches. New spark plugs do not need adjusting as they are preset at the factory.
On the inline six cylinder engine , spark plug # 6 is the rear spark plug On the V6 engine , spark plug # 6 is the rear plug on the drivers side of the engine On the V8 engines , spark plug # 6 is the 2nd plug from the front on the drivers side of the engine
this is the proper
1.08mm OR .042"
On the Chevy V8 it is on the front of the engine driver's side. On a inline 6 cylinder it is the plug on the front of the engine. On the V6 it is the front plug on the passenger side.
Number 1 will always be the front cylinder on an inline engine.