flexplate interchangeable?

[trickc]

just got my "new" 360 from lightnin but doesnt have a flexplate on it. I've got 2 304's with em can I just swap em? I seem to recall something about balancing being different from a 304-360.
Also is there a such a thing as a HD 360,its a 76 with the emission label on the air cleaner that reads 360 HD or are they all HD? Heavy duty? hopefully not Hydro locked Dang it.

[Michael F]

The 360 flex plate for the t400 looks like a 3 spoke wheel with one hole mostly filled in to act as the balance weight and the 727 one is solid with a weight welded to it. The 258 one for the 727 is solid but with no weight.

Hope this sort of helps.

[jeepbob]

No, you can not use the flexplate from one size AMC motor on a different size. The motors are externally balanced so all the plates are different between sizes.
The HD is for heavy duty emissions which there was no catalytic converter.

[ September 03, 2001: Message edited by: jeepbob ]

[ibnfe]

jeepbob is right. They all have different balance points and weights on the flexplate. I suppose you could use one from a 304 in a jam, but the downfalls are more than I would be willing to risk, especially if it's a new motor. Excessive wear on the main bearings being the biggest! Same goes for the harmonic balancer. All those are differently balanced as well.