6.5 swap

[dave1969]

Can I use a flywheel off a 350 gas on a 6.5? It fits and bolt pattern is the same.If not why? Thanks

[DmaxMaverick]

No, you can't use the flywheel/flexplate. The engines are externally balanced, and different.

[dave1969]

Thanks for the reply. I will try to hunt one down. 6.2 and 6.5 all the same I assume. Dual mass or single?

[trbankii]

When I replaced the clutch and flywheel on my 6.5, I went from dual-mass to single-mass. There is a balancer in the transmission (manual) that supposedly is needed for the single-mass flywheel, but I haven't noticed a difference.

You'll find people on both sides arguing the merits and demerits of each setup.

[DmaxMaverick]

Correct, the 6.2 and 6.5 are the same.

As said, if switching from a dual mass flywheel to single, the torsional damper is required ("balancer" is a misnomer). Also, if using a gasser tranny with a single.

[dave1969]

I c . So im running a sm 465 trans so my best bet would be a dual mass flywheel,,,,correct?

[dave1969]

BTW. My truck 1986 GMC 3/4 ton 4x4 only thing original are the 2 frame rails!!!!!!