Flywheel for 1990 year model 350

[CruzinHigh]

Guys,

I have a 1990 year model chevy 350 that I had in my Iroc that I am swapping into my truck now.  Originally, I had a 305 in the Camaro and that motor was an 88 year model.  Ok, so these are both 1 piece rear main seal motors anyway, but I am wondering about my flywheel and if the one that was originally on that 88 year model 305 will work on my 1990 year model 350.

The flywheel is extremely lightweight looking, and it is a manual transmission flywheel.  (Don't know if there's a difference really).  This is good, since my truck is also a manual tranny, 3 spd. with low gear.

I had been running that same flywheel on the Iroc after I did the 305 to 350 swap, and it never had any horrendous vibration or anything.  I think I had confirmed years ago that it would work too, but this motor has been sitting now for years.

Currently it is at my friend's dyno shop and I am fixing an oil leak at the rear main seal and taking care of a wiped out thrust bearing    before all goes back together again.  Not sure how the heck that happened in roughly only 5000 miles!  Everything else is mint though at least..

[Captkaos]

The flywheel should be fine.

[CruzinHigh]

Good to know.

Thanks Chris.

[VileZambonie]

Wiped out the thrust bearing... what do you have for crankshaft end play?

[CruzinHigh]

It had about .030" of end play!

I can't for the life of me figure out how I would have thrust loaded that flywheel bushing so hard with my T-5 in the Camaro, but maybe I screwed up the bushing install.

Thank God the damage was minimal, but we're regrinding the crank and doing all new mains and rebalance again too.

What sux the most was that I paid big bucks to have that short block built by speed shop and there was obvious neglect to a huge wear pattern in the rear main seal area.  Can't help but wonder why the thrust bearing failed too....      Thankfully I am working on the motor with the owner of RPM performance and dyno here in Wausau now...

[VileZambonie]

Any Chance the trans input is forcing in on the crank? Or the bearing was improperly installed?

[CruzinHigh]

Any Chance the trans input is forcing in on the crank? Or the bearing was improperly installed?

Bingo..  My thoughts exactly.

I just don't know how I could have messed up a simple brass bushing install that receives the input shaft from the T-5 that was in the Camaro. 

My guess?  The jag that built the shortblock originally messed something up.  Ahh.. Whatever, doesn't matter now as long as I make sure I get the Muncie in my truck mated up to this thing properly now! 

Thanks for the help guys.   As always, your input is much appreciated!