Technical SBC Flywheel ID

I bought a combo of 4 spd muncie, shifter, scatter shield, flywheel, clutch, pressure plate. I've id'd the parts except the flywheel. It has the numbers 0021300 stamped on the outer edge. It looks to be internal balance. The flange pattern makes me wonder what it came off of. The locating dowel hole wasn't used. I want to use this on a early 283 in my gasser Chevy II. Anyone recognize the numbers? I've searched all the major manufacturers numbers.

 

The back side photo of the flywheel shows an image of the crank mounting pattern.



Pontiac, Oldsmobile, and Buick cranks all have a round mounting surface. with some sort of varying knotch to identify what engine it came from.

 

So....what is it that makes you not be able to use it if you can't identify it? Do you have a bellhousing that works with that diameter flywheel? and a starter? and a clutch? Do you think you might want to get a steel flywheel to be more safe? If so, just buy one and be done with it.

 

I just want to make sure it isn't for external balance 400 sbc etc. I dont see a balance pad on the back but, the front has a series of drilled balance holes. The car isn't going to be a balls to the wall build.

 

I don't see any indication that it's an external balance flywheel.

If you are getting the engine balanced, bring the flywheel along and have it neutral balanced too.

 

The holes are just to balance the assembly you’d see that irrespective of it being internal or external. But there is no weight on that and nowhere to attach one so it’s internal like Squirrel says.

 

I built the 283 a few years ago. I'd like to balance it but, then I'd have to take it apart and start over. LOL
Thanks everyone.

 

See a connection?

 

That's similar to the pattern. I've never seen a sbc crank with the pattern shown on the flywheel. Could have been a weight plate. Or maybe a aftermarket crank.

 

That looks like the smaller flywheel Chevy used. There are two diameter and tooth count flywheels used. In earlier cars, all used the larger flywheel that is roughly 14 inches in diameter and has 168 teeth. In the 60's they introduced a smaller flywheel measuring approximately 12 inches in diameter and having 153 teeth. Yours appears to be the latter. I have a 153 tooth unit and it accepts a 10 or 10.4/10.5 clutch. It also uses a different starter that the 168 tooth flywheel. The 153 starter has straight across bolt pattern to mount on the block and the 168 tooth uses a staggered pattern. I believe ( but don't hold me to it) that the 61 and earlier units used the big flywheel and the starter used a flange and bolted to the bellhousing. If someone wishes to chime in, be my guest.