More flywheel info

Posted by jdemaris on December 27, 2006 at 14:43:32 from (66.218.18.243):

In Reply to: ANOTHER QUESTION posted by Dave Sherburne NY on December 27, 2006 at 10:09:26:

I want to clarify what I said about no other flywheels fitting a 6.2 diesel. Actually, flywheels from several gas-engines will fit - but are still not correct - this includes small and big block chevy engines. I've got piles of OEM GM tech manuals but I've yet to find specific info on 6.2 diesel engine balancing.
I don't know what year your 350 is - but a 1985 350 gas flywheel and clutch will physically fit the 6.2.
As far as I can tell - the 6.2 diesel requires some external balancing via the flywheel mass - whereas most small and big block gas engines do not. The end-of-crank flange and bolt pattern though is the same for many gas and diesel engines that use the two-piece rear-main-seal. 6.2 diesels changed over to a one-piece around 1992.
So - from anything I've read over the years - to be right you need a flywheel made for the 6.2 diesel and nothing else should be used even if it fits. The clutches from gas engines are not a problem, but the 6.2 is supposed to have a 12" clutch. Many gas engines use smaller clutches - which also might have something to do with the flywheel differences. GM #3991469 gas flywheel fits many SM and BB engines from 1955 - 1985 but will not take a 12" clutch.
As I said earlier, there are lot of used OEM flywheels around. Also, places like Partsamerica sell new 6.2 diesel flywheels from Pioneer - # 502710.
Oddly - Centerforce sells new racing-flywheels that are listed to fit 1969 small-block Chevys and also 1984 3/4 ton Chevy 6.2 diesel trucks. I have no idea what that is all about.

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