Help to ID SCHIEFER AMC FLYWHEEL-390

It looks like your going to have to find someone with an original Schiefer catalogue.

The numbers are definitely not big block Chev or Ford from what I've searched.

That said from what I read Schiefer were known for lighter weight and neutral balance flywheels at the time.

It may bolt up but the neutral balance would have to be dealt with if that's the case.

If you have a stock flywheel or flex plate then a machine shop can compare the two. If they balance the same less the two lbs you are good to go. A good shop should be able to calculate for the weight difference. That's what they do when switching between a flywheel and flex plate.

A friend of mine knows the grandson of the original Schiefer Performance owner. He is going to try and get in touch with him to see if he has any information on that flywheel.

Dennis

Former Owner of:
The Craig Breedlove "AERO AMX"

Still Owner:
SS/AMX #9 replica (THE BIG MENACE)
70 AMX 416, EFI, Nash 5 speed
70 Javelin 401, 727 (Wife's car)
72 Gremlin Autocross Project.

I also have 40 pound steel schiefer flywheel that I purchased (supposed to fit the 343) and I had it precision balanced with the whole rotating assembly. I am assembling that motor now. The number stamped on the flywheel is 40-50408. I purchased the Shiefer catalog I reference below after I bought the flywheel, but as you will see it was only a little helpful. All that it told me was that Shiefer produced both steel and aluminum flywheels (among many other parts) and that one part number applies to 343,360 and 390 engines. I will say that the shop that balanced my wheel along with the rotating assembly drilled out a buttload of metal to get it to balance. The shop has a great reputation and I'm glad I had it done. I can send pics of the back side where they drilled it but it looks the the one you pictured in your original post. Note that the digit "4" in my flywheel could ( and probably does) mean that it is a 40 pound flywheel). Yours is reportedly a 30 pound flywheel. Although the catalog numbers won't help you, the fact that the same flywheels were meant to apply to 343, 360 and 390 engines is a telling point.

My Shiefer catalog lists the AMC flywheels (all fit 343, 360 and 390) engines as 630-0032 (aluminum) 630-0025 (30 pound steel) and 634-0025 (40 pound steel). The catalog goes on to mention that for best performance, the flywheels should be re-balanced with the engine.

Joe

Happiness is making something out of nothing.

amxess wrote:

Thanks Dennis! Let us know.

Not much help!

The grandson asked his dad and his dad said he doesn't think that number was an AMC flywheel and he recognized the number, but thought it was for a more common flywheel than AMC.

Since pacerman has an old catalog maybe he can find the number of yours listed for another application??

Dennis

Former Owner of:
The Craig Breedlove "AERO AMX"

Still Owner:
SS/AMX #9 replica (THE BIG MENACE)
70 AMX 416, EFI, Nash 5 speed
70 Javelin 401, 727 (Wife's car)
72 Gremlin Autocross Project.