258 Flywheel same as 304? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 04-10-2007, 11:40 AM Thread Starter
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258 Flywheel same as 304?

I'm in the middle of swapping my 258 for a 304 and was wondering if I can use my old flywheel on the 304. I've looked at a couple of onlinen parts stores and it appears to be the same part number, just wondering if any of you have done this or happen to know if it swaps over. If not I might be able to get one from a junk yard around. Are they the same from a 304 to a 360?

I could have had a V8
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post #2 of (permalink) Old 04-10-2007, 02:06 PM
 
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No, the flywheel will fit, but it will not be balanced to match the 304. A machine shop may be able to do it for you.
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post #3 of (permalink) Old 04-11-2007, 07:43 PM
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As TiminMb says, it will not balance. All AMC I6 and V8s are externally balanced. I would buy the right flywheel and not hope that at machine shop gets it right.

LEVE gave me a good link not long ago.

amc flywheels


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1978 CJ5, AMC 401, CJ T18, Scout D300, 2 1/2" Lift, Locked Front/Back
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post #4 of (permalink) Old 04-12-2007, 06:29 AM
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Quote:
All AMC I6 and V8s are externally balanced.
I thought that the sixes were not externally balanced. Could be wrong - I was once before.

EVERYTHING's easy for the guy who doesn't have to do it.
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post #5 of (permalink) Old 04-12-2007, 07:34 AM
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Take a look at:

AMC 258 Flywheel Balance
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post #6 of (permalink) Old 04-12-2007, 09:38 AM
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Well I blew another AMC I6 question but why then do you need to change out the front vibration damper when you install the Multi-Port Fuel Injection Kit on the 258? I thought that it had to do with the external balance. Although I now know that the flywheel needs to be in perfect balance where the V8s are in "off" balance with the added weight.

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1978 CJ5, AMC 401, CJ T18, Scout D300, 2 1/2" Lift, Locked Front/Back
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post #7 of (permalink) Old 04-12-2007, 10:00 AM
 
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Quote:
Originally Posted by Saddle Tramp View Post
Well I blew another AMC I6 question but why then do you need to change out the front vibration damper when you install the Multi-Port Fuel Injection Kit on the 258? I thought that it had to do with the external balance. Although I now know that the flywheel needs to be in perfect balance where the V8s are in "off" balance with the added weight.

Kriss
The newly designed damper has a crank position sensor on it. Saves pulling the engine and modifying the flywheel and bellhousing to make it like a 4.0L setup.
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