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I've read the other posts and part numbers....but will a 360 wheel work on a 401? If not, does someone have the number that is cast on only 401 flywheels? <IMG SRC="smilies/smokin.gif" border="0"> <IMG SRC="smilies/smokin.gif" border="0"> Me no smoke...why?, cause you make me pee in little bottle...
 

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I have always heard thet the AMC engines must have the flywheel matched to the engine due to balance. You could call the dealer and have the look up the part numbers to see if they are the same or you could order the mopar Jeep engines book
 

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Originally posted by Chark:
<STRONG>I've read the other posts and part numbers....but will a 360 wheel work on a 401? If not, does someone have the number that is cast on only 401 flywheels?</STRONG>
Oh man, now I wish I remember all those conversations the die hard AMC guys used to have.

I seem to rembmer talk along the lines that there were two types of AMC 360's an Internally balanced (crankshaft balanced) and an Externally Balanced (flywheel balanced) and one would work with the 401 and one wouldn't. I don't know for sure, and I'm probably wrong -- thinking about an a different manufacturer or something, but it might give you something to look for.

- Mike
 

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360 flywheel will NOT work on a 401. I have that exact setup and I had to have the 401 engine rebalanced to use the 360 flywheel and even then they took some weight out of the flywheel. I did this because I couldn't find a 401 flywheel and chose 360 thinking it'd be closer to what I needed than a 304's flywheel. Turns out I was wrong and the 304 flywheel is quite close to a 401 flywheel and the 360 flywheel is way off <IMG SRC="smilies/rolleyes.gif" border="0"> I believe Hammer (POR username) ran a 304 flywheel on his 401 for a short while but even he would tell you to rebalance the engine for the 304 flywheel. This can be done without modifying the 304 flywheel so then if/when you need another one 304 flywheels are dime a dozen. Try finding a 401 flywheel sometime. Actually, there's a guy here in CO that has a 401 flywheel for sale if you're looking for one. Search the For Sale board at CO4x4 (link in my sig) if you're interested, I think he still has it. FWIW though if Ihad it to do over I'd rebalance to use the 304 flywheel.

[ 10-12-2001: Message edited by: Eric Ruhl ]
 

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Take yor 360 flywheel and a 401 automatic flex plate (flywheel) to an engine balancing shop and they can transfer balance the 360 flywheel to use on a 401.
 

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rwsj,

How much for a shop to do that?

I can guess removing weight isnt expensive ( drilling) but adding weight probably is right?"

Eric Ruhl, what did it cost you to have yours rebabalanced and how did they do it?
 

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Originally posted by ozarkjeep:
<STRONG>Eric Ruhl, what did it cost you to have yours rebabalanced and how did they do it?</STRONG>
It has been so long I don't remember the cost. Might vary from shop to shop too, mine was done at a little place called East End Speed in Ephrata, PA. Any speed shop should be able to do it.

Take everything attached to the crankshaft from harmonic balancer to the flywheel. Good time to switch to a 304 balancer too it they're different (I think they are different, anyone remember?). This includes pistons and connecting rods but I don't remember if the timing gear goes too. They'll tell you what to bring. Yes this means dismantling the engine, but you should be able to do that anyway <IMG SRC="smilies/biggrin.gif" border="0"> Of course then you enter the realm of "now's the best time to do it" where it'd be good to hot tank the block and replace bearings, seals, yadda yadda yadda <IMG SRC="smilies/rolleyes.gif" border="0"> I did all of that including new rings and as best I can remember everything came to $700 or so. I just don't remember the price breakdown for the balancing part.

If you use the 304 flywheel they won't need to modify it as I mentioned above. This is nice for possible future replacement. 401 stuff isn't all that easy to find anymore (at least not in my experience). Go to http://www.froadin.com and browse around, it's an excellent resource for AMC info. "Hammer" runs it and he can tell you about using the 304 flywheel on the 401.
 

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Originally posted by ozarkjeep:
[QB]rwsj,

How much for a shop to do that?

I can guess removing weight isnt expensive ( drilling) but adding weight probably is right?"

Last one I had done at Rex Hutchinsons Racing Engines in Sacramento cost $ 150.
 
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