All of the flexplates from 390's have about 6 - 8 partially drilled final balance holes in the same location. I have several stock Ford FE/C-6 flexplates that would physically fit in place. Thanks for the help.I am putting a C-6 behind an already assembled 390 that has a 64 - 65 crankshaft (C4AE). Like looking at the rear of the motor (or a later model flexplate), are the balance holes at 3 o'clock, 6 o'clock or whatever from the rear counterweight. Does anyone have a 64-65 flexplate to look at and let me know what it looks like, please? It would be real nice if one could be compared to a later model flexplate to see if the indexing is the same OR maybe get an idea of where any balance holes are drilled in relation to the rear crankshaft counterweight. I have not seen a 64 - 65 flexplate that I know of, and was wondering if the 64-65 usually has the same series of holes drilled in for balance. Usually in about the same area of the flexplate. I have noticed that the 66 and up 390 flexplates have a lot of (6-8) balance holes drilled part way thru. I am going to use an already built low rpm stock 390 with a 64-65 crank in it, and want to use a later model c-6/flexplate.
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