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Username Post: Early model vortec 350 to Saginaw/Muncie 4speed        (Topic#355494)
Posts: 1

Reg: 03-04-19
03-04-19 08:31 PM - Post#2761333    

Trying to find the flywheel I need to marry these two together. The center holes need to 3 inches from center to center. If anyone knows the flywheel that will work for this set up please lead me to right direction. Thank you

Posts: 236

Loc: Parsippany, NJ
Reg: 10-08-02
03-05-19 05:05 AM - Post#2761350    
    In response to Samuelsteagall

Have you tried Advance Adapters?...If they don't have it, they may be able to direct you.

Dedicated Member
Posts: 5689
Age: 68
Loc: Everett, Wa.
Reg: 02-26-08
03-07-19 10:40 AM - Post#2761536    
    In response to Samuelsteagall

I'm old school, so the later model stuff is not my best suit. But this I do know; if the crankshaft flange where the flywheel bolts is completely round (one piece rear main seal), then you need a flywheel that IS counterbalanced, and NOT neutral balanced. If there is a balance pad on the crankshaft flange (two piece rear main seal), then you need a neutral balanced flwheel. Since there are no 400 SBC Vortec engines, we won't go into that engine. The other issue is diameter; 153 tooth or 168 tooth flywheel; stater motor with straight across mounting bolts, matches up with a 153 tooth flywheel; stagered starter motor mounting, 168 tooth flywheel. With that information, you should be able to track down exactly what you need. The only remaining issue is clutch size to match the flywheel, and then the correct length throw out bearing to match the clutch. I am Butch/56sedandelivery.

Mad Professor 
Posts: 104

Reg: 12-30-08
04-21-19 06:04 PM - Post#2764782    
    In response to 56sedandelivery

Good point on internally balanced , or externally balanced with the flywheels.

Also need to match up splines of friction disc, to input shaft, and output shaft to driveshaft yoke.

I know the early muncies were coarse spline on both shafts. Then they switched both to fine spline, the output shaft on the later muncies was the the same as the automatics ( TH350/400).

62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
89 S10 baja package

Senior Member
Posts: 1656

Loc: Whitewater, CO
Reg: 05-25-01
04-28-19 05:35 PM - Post#2765240    
    In response to Mad Professor

No Adapter is needed.

The bellhousing bolt pattern is the same...I believe what you have is the one-piece oil seal crank bolt pattern.

When they went to that pattern, they changed the size of the crank flange...among other things. That was in '86...the same year they went to TBI.

So, all you need is the correct flywheel for your motor, not your trans...although there may be dif teeth counts on the flywheel.

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