jpreston89gt

Small block reciprocating assemblies have external balance. The crankshaft itself does not carry enough counterweights to achieve zero balance. Extra counterweighting is cast into the flywheel and harmonic balancer bring the entire assembly into neutral balance. Early engines use 28.2 oz.-in. external balance, while 1982 and later engines use 50 oz.-in. at the flywheel and 34 oz.-in. at the damper.
Automatic transmission flexplates have a welded-on weight plus a cutaway window on the opposite side. Rivets are used to fine-tune the balance.




Note the small counterweight on this 28.2 oz.-in. flywheel. This flywheel from a 1965/68 Mustang 289 has a 157 tooth ring gear. There are (6) 5/16"-18 pressure plate attaching bolts on an 11-3/8" circle. This holds a 10" clutch. Part # C3AZ-6375-J identified by casting # C6ZE-A and stamped engineering # C7ZE-B.
Note the larger counterweight on this 50 oz.-in. flywheel. Ford Motorsports part # M-6375-B302. This flywheel from a 5.0 High Output engine also has a 157 tooth ring gear. This holds a 10.5" clutch, accurately centered with alignment dowels and attached with metric bolts. here is how to tell the difference.

bighungrymatt

thanks

92civy

Interesting First post, lol!

AdderMk2

you could atleast credit your source.... plagarist!

jpreston89gt

I would credit the source if I could find it,sorry. but I hope this helps because I learned the hard way.

bighungrymatt

haha, no worries

1992gt400hp

ok, so will this flywheel off the older car(28.2oz) work wth the t5 in my 92 (i am considering a 351w swap)??? will the clutch for a 65 or so model work with the t5?

AdderMk2

why dont you just use the clutch you are supposed to use, with a proper size 28oz flywheel?

jpreston89gt

I bought a flywheel for a 1979 mustang and a matching clutch kit for a 302 which is the same up to 1981 for the 351w. partsamerica.com has the flywheel for 166.00 I got the clutch kit at my local advance auto parts at about 150.00.