Does anyone know of a good 1966 Hi Po 4 speed flywheel replacement? Originals are very hard to come by and when I've found one it is often heat cracked. I'm not worried about originality, just want one with the proper 30.2 ounce imbalance. Any help or suggestions would be greatly appreciated.
Thanks, Kerry
It will probably be necessary for you to select an appropriate substitution and then have it match-weight balanced to the "H.P." specification. ;)
Or you do like so many other H.P. owners have done, ignore the fact that it 'is' different and just move on! :o
Not that that's "my" recommendation. ::)
Scott.
I have a few early flywheels... Any particular numbers you are looking for?
The numbers I found on MustangTek that are correct for a 1966 Hi Po Mustang 289 are: C30E-6380-B with a 30.2 ounce imbalance.
I have that one... C3OE-6380-B
427heaven,
PM sent.
Quote from: KMKUWL on November 13, 2025, 07:22:25 PMjust want one with the proper 30.2 ounce imbalance. Any help or suggestions would be greatly appreciated.
Just a note:
Ford never provided a specification for the "surfacing" of the flywheels; rather generally the statement was that, "if the used flywheels' surface is unacceptable to be put back into service, it should be replaced", or something along that line. :)
Part of the reasoning for this is that the flywheels' function includes a heat absorption capacity, and this requires a sum of mass. So if due to in service usage, the flywheels' face is damaged due to excessive heat, causing scoring, metal movement, even heat shrinkage displayed as checking or cracking, then "resurfacing" it by the reduction in the mass also reduces its' tolerance to the heat when returned to the same environment, meaning the service life the next time around will be even shorter! :o
Now, I'm not sure if this was an observation or concern at F.M.C. but as one whom has surfaced a number of flywheels, if any real heat has been applied causing any significant damage to the face of the wheel, another result is that the flatness is also lost to uneven cupping, warping, waviness, etc.; which means the sum of material being removed to make the face flat again is not generally equal about the circumference and therefore the balance value is changed! Sometimes significantly, but most always a sum greater than the tolerance acceptable in a proper balance effort. :o
Scott.
Did not receive PM ... Try again
Done.
Best of luck on your restoration! :)