8N popping/sputtering at idle

I have a 1952 8N (8N 500585) that has a popping/sputtering sound when it idles (450 RPM). I tuned up the ignition system (points .025", Autolite 437 spark plugs .025-.028") The markings on the flywheel are non existent so I rotate the distributor clockwise/counter clockwise to set the timing. I replaced the carburetor with a fully restored Marvel-Schebler (idle adjustment needle 1/2 turn; main jet adjustment needle 1 turn). The results of the compression test: 1-115, 2-115, 3-120, 4-115. I also used a propane torch looking for an air leak involving the intake manifold with none observed. Any advise/guidance would be appreciated concerning this popping/sputtering sound at idle.

Follow Ups:

• Re: 8N popping/sputtering at idle - Ed Gooding (VA) 06:03:17 05/20/26 (0)
• Re: 8N popping/sputtering at idle - Farmer Brown 03:53:30 05/20/26 (0)

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