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Discussion Starter · #1 ·
Hello all Im looking for information regarding flywheels for a 50 Panhead, in all of my research and using the search function I havent found a definitive answer. Can anyone identify this part # 150-40 also on the flywheels are the numbers 16-7. Ive got a bottom end rebuild and need a stock 74in flywheel setup. Thanks for any info
 

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Discussion Starter · #5 · (Edited)
Mean anything to anyone? this is a description provided to me about "pan" flywheels ? ? ?

1940-54 OEM OHV Old School STROKER FLYWHEELS . These are turned down BT SV Wheels . These are made from SV flywheels they have a pin to pin distance of 2-1/4" & overall 8-1/4" in Diameter<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:eek:ffice:eek:ffice" /><o:p></o:p>
 
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The SV motors used the same crankpin as the 61"OHV motors...

These are a step-pin...The pin hole diameter starts at 1-1/8 and tapers to 1"
Some Guys have them converted to the 41 up FL pin and in doing so will net you a little more stroke...Also the wheel O.D. diameter is smaller then the OHV models...(8-5/16 for the SV, 8-1/8 for the 36 to 40 EL's, and 8-1/2 for the 41-up FL's and El's)

It's not much of a gain to use these wheels.
Still is old iron...!!

http://www.truettandosborn.com/flywheels.htm

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If they are UL wheels they have a different casting number ending in 37. Unless you plan to do some other mods to your pan don't bother with them. And if they are lightened they are worse due to loss of low end torque.
Be aware that both 61ci and 74ci flywheels have the same casting numbers. You need to measure the stroke to be sure. The lock tab screw hole is also in a different place relative to the crankpin as the nuts are smaller!
Robbie
 

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First number is day of the month, second number is year, letter is month, same as cylinder codes.
Since they are tapered shaft wheels the middle six is '46 so they were originally in a '47 Knuckle.
 
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