sm465 flywheel question?
 

Im building an 86 K1500, but I got a 79 K10 stepside given to me for parts back in the winter. Stripped the body off the frame, built the frame, kept the drive line.

350 4bbl 4 bolt, sm465... motor Is seized solid. So I have an old tbi 305 in my shed that ran great when pulled.

so heres my Question:

Will a 79 350 flywheel bolt up to a 1988 305 TBI crankshaft??

Re: sm465 flywheel question?
 

No. In87 they went one piece rear main seal so requires different flywheel sorry...
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Re: sm465 flywheel question?
 

okay... would a flywheel from a 1987 sm465 work with a 79 sm465? or would i be better off to use an earlier motor?

Re: sm465 flywheel question?
 

as far as i know all the flywheels are the same other then bolt pattern.
the only other thing is the big blocks i think are external balince and smalls are internal.

some one check that that know better????

Re: sm465 flywheel question?
 

nope

nope

^^^^^THIS^^^^^

Here are some AC Delco part numbers

1979 > manual flywheel 388001
1987 > manual flywheel 388004

I think its more than just bolt patterns , center hub bore diameter is different.

New stuff is no that expensive.

Desert

Re: sm465 flywheel question?
 

More than that. ^^
You've gotta be careful to mate the right flywheel and harmonic balancer to your motor. There were internal and external balance small-blocks.
I believe the 400SBC was external balance and some of the one-piece rear main seal 86+ 5.0L-5.7L motors were as well. The older two-piece rear main seal 305-350 are usually internal balance.
The 5.7L, 6.2L, & 6.5L diesels were external balance. The 5.7L Olds Diesel never came with a stick in this country.

I don't do big blocks so I'm not sure on those.

Re: sm465 flywheel question?
 

Good point, 454's were external