I'm just what you guys need, another member with WAY more questions than answers............
I currently have a 428 in my 76 f-250 4X4. The 428 was in a 62 F-100 4X4 I purchased in 1978. I ran the part numbers and it seems to have all the right parts to be a CJ or possibly a SCJ due to the fact it had a lug on the dampener spacer that somehow got lost while it was stored. The numbers on the rods don't match either the CJ or SCJ tho.. I got the 428 out of storage a few years back rebuilt it and installed in the 76.

The machine shop balanaced it by removing meat from the flywheel and the motor is very smooth has about 40K miles on it with no vibration issues.

I also have a 58 Fairlane 500 2 dr. hardtop with a 300 horse 352 and cast iron Cruise O Matic.

I want to plant the 428 in the Fairlane and back it up with a C-6.

Do I NEED the Crank Lug?

Can I buy a flexplate that will work?

What harmonic balancer should I use?

Thanks, and sorry for the long first post...

If the machine shop balanced it without the "hatchet" that goes behind the balancer, adding it now would put it out of balance.

The problem is, "is there enough weight on a C-6 flexplate to copy what I assume was a manual tranny flywheel"

If they didnt touch anything else and only did the flywheel, AND you know it is an SCJ, you may be able to go with a 428 flexplate and SCJ hatchet, but its a guess at this point, we dont know exactly what the machinist did


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- 70 Fastback Mustang, 489 cid FE, TKO-600 5 speed, 3.70 9 inch
- 71 F100 shortbed 4x4, 397 cid FE, headers, Street Dominator, 280H, 5 lug Dana 60, 4 speed

Since the motor was balanced without the hatchet and with a manual flywheel, I would take the flywheel and the flex plate to a machine shop and see if the flex plate could be balanced to the same as the flywheel. I would think it could be, RWJ

They should be able to do it without any problems. I did 2 standard Flywheels balanced to my 428 flexplate. Also I have done it with a 6.9 diesel from a standard flywheel to the C6 Automatic Flywheel. Boy are those damn things heavy! LOL.

"The Poor Mans 427"
http://www.fordification.com/poormans427.htm

1973-1979 Ford Truck Enterprise Link:
http://www.network54.com/Forum/399900



Wes Adams FORD428CJ
Built Ford Tuff With Good Ford Stuff
79 F-250 X-Cab 4x4 with a 6.9 Turbo Diesel
64 Falcon X-Ram 428
55 FORD Truck 4-link Rides on air with X-Ram 428
2000 Yamaha V-MAX VMOA#4277
2000 Yamaha 700 Mountain Max
2001 Polaris 600 Edge X
2001 Polaris 500 SP

I believe that a standard 428 flexplate comes with a 42 or 48 gram weight to begin with. Seems like the machine shop could match the balance of the flywheel vs flexplate. You would not be matching total weight anyway, just the balance.....I think

Forgot to mention the Truck the engine is in has a 4 speed.
So I just need to have the machine shop ADD the amount of weight to a flex plate to equal the amount of weight REMOVED from the 4-speed flywheel....
Why didn't I think of that...

...the flywheels should be neutral balanced, if for no other reason than to make interchange easier. A 410/428 auto-trans flywheel was originally an off-set (external) balance. You need your machinist to add OR remove weight, IF necessary, to match the balance of the smooth running manual flywheel you have been using.