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11-22-2003, 09:26 PM
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Flywheel interchangable?
Hey guys, just a simple question, I hope at least. Will a flywheel off of a 1977 305 bolt onto and work on a 1986 350 block? Thanks guys...
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11-22-2003, 09:32 PM
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 Chevrolet changed the oil pans in 86 or 87. When the oil pans were changed.......the flywheel flange was also changed. I just do not remember.........86 or 87......... I know 87 will NOT interchange and believe 86 will not either...........but I could be mistaken about the 86......... I suffer from CRS Can't Remember Stuff........ 
__________________
"I won't be wronged . I won't be insulted, and I won't be laid a hand on. "
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11-23-2003, 06:55 PM
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thanks man, i was afraid of this...anyone know for sure?
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11-24-2003, 08:40 AM
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86 was the change over year. Pre 86 used a wide bolt pattern. Post 86 used the smaller bolt pattern. Some small bolt pattern stuff was also used in the 60's behind 327 powered trucks with three speeds if you can locate one. They are are internal balance.
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11-24-2003, 07:18 PM
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so basically, I need to find a post-1986 block from a manual trans car and have the flywheel machined? And this could be a big deal as I just put a brand new clutch on and I was gonna use it with the new engine, but I bet I'll need a different size clutch on a new flywheel. Or is there any other solution like an adapter of some sort?
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11-24-2003, 10:12 PM
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GM started the changeover to one piece rear seal in mid 86, your 77 flywheel will not fit a one piece rear seal motor. Not only is it impossible to mount, the 86 and later flywheels are balanced to the later external balanced 305-305 engines.
You will have to find a flywheel for a 305-350 one piece rear seal motor!
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