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rotorwrench · 07-12-2020, 10:35 AM

The 41T designation is not common since it originates from wartime production (1944 221 CID). The T is definitely a truck designation. Is this a casting number from the cylinder head? Ford produced 41A blocks as replacements for agricultural purposes starting in 1944. They are a 221 block and many have the "59" casting mark on the back bell but not all of them do. The 59A 239 CID engines were produced starting in 1945 and both engine blocks likely shared the same outer mold in the casting flask.

Is this rough spot a vibration or is the engine running rough. Rough running during acceleration could be due to a power valve problem. Rough running during a steady RPM could be a problem with the main fuel metering circuit somewhere. What carburetors are you running?

Vibrations that are RPM sensitive are generally resonant vibrations than can come from anywhere in the vehicle. Wheel & tire problems are the most common cause of resonant vibrations. If the engine, transmission, or drive train vibrates then it can cause other things to resonate when just the right frequency (RPM) is reached.

07-12-2020, 10:35 AM	#2
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,436	Re: Rough spot The 41T designation is not common since it originates from wartime production (1944 221 CID). The T is definitely a truck designation. Is this a casting number from the cylinder head? Ford produced 41A blocks as replacements for agricultural purposes starting in 1944. They are a 221 block and many have the "59" casting mark on the back bell but not all of them do. The 59A 239 CID engines were produced starting in 1945 and both engine blocks likely shared the same outer mold in the casting flask. Is this rough spot a vibration or is the engine running rough. Rough running during acceleration could be due to a power valve problem. Rough running during a steady RPM could be a problem with the main fuel metering circuit somewhere. What carburetors are you running? Vibrations that are RPM sensitive are generally resonant vibrations than can come from anywhere in the vehicle. Wheel & tire problems are the most common cause of resonant vibrations. If the engine, transmission, or drive train vibrates then it can cause other things to resonate when just the right frequency (RPM) is reached.