Found this on my engine today... a few folks believe it to be an old RB light steel.

Engine is an s5 TII

 

Can I call it Ricky Bobby?..(name that flywheel..oh boy!)..
All Kidding aside though,Can you weigh it?..That may tell you if it is close to the RB lightened steel flywheel weight.
It does look like one.

 

If it is its definitely nice to have , they go for like $370 new plus shipping

Rotary >Pistons

 

im gonna say........ 17 lbs!

 

If its the rb its probably more like 10-13 lbs not including the counterweight

Rotary >Pistons

 

RB doesn't sell a TII lightweight steel flywheel (at least any more) but the pic for the N/A has a TII flywheel that looks pretty similar. Just look at it, all creepin' up in the back like it knows what it's doing....

 

It could be the older one, I had the lightweight steel one on my old na.

Rotary >Pistons

 

RACING BEAT LIGHT FLYWHEEL FOR TURBO II

"...compared to 17 lbs for the Racing Beat Flywheel..."

 

That's it (on the top).

Even has the little step for the mounting surface!