NOT a 265 or 283, those are riveted together, although some 283's use just a "hub" with NO elastomer or ring of any kind. So, 327 AND early 350. Do a Google search for "Images of SBC balancers" (I prefer to call them dampeners). Factory and aftermarket balancers/dampeners are displayed. The "High Performance" dampeners are usually larger, but we all know ANY of these dampeners can be swapped around that are neutral balanced, and the appropriate timing tag used. We use a lightened or lighter weight flywheel to allow engines to rev quicker, same with a dampener. I'm not sure how the larger dampeners came to be used, unless it's because of all the accessories driven off of them, and the torsional issues associated with those. But then again, I'm NOT an engineer by ANY means. To answer the OP question, "Is this a normal 350 balancer"; it is AND is't. Use it, I would. I am Butch/56sedandelivery.
I took another look at it and it looks like one for a 350... We just need a side shot photo of it to confirm...
In relation to the keyway/spoke on the damper. If the outer ring has not slipped I *think* the timing notch is in the position for '70s SBCs. IIRC pre-'350' dampers had the timing notch in the 12 O'clock spot. 80's SBCs used that funky timing tab mounted behind the waterpump with the notch ~45° before.
Should work on a 350, however the elastomer- rubber ring looks to be NOT in the best shape. Outer ring can slip, and or walk.
Standard performance 327 damper (harmonic damper), maybe even early low perf. 350. A balancer...balances things, a damper...dampens things (harmonics). These devices, dampen crankshaft harmonics. They don't balance...anything. Mike
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