Right, each rotating assembly should be balanced to as close to so-called "stock" as it can be, then you can use stock balanced flywheels/flex-plates and dampers regardless.
You don't want to fine tune a balance job by balancing each flywheel/flex-plate or damper to a specific rotating assembly b/c then the parts will be out of balance for use with other rotating assemblies that aren't dead-nuts balanced the same.
And for our pre- '86 SB's and all our BB's, you can tell if one is internally balanced or externally balanced by the dampers.
All pre- '86 SB's except the 400 has a round damper, the 400 has part of the damper's outer ring removed in a 2/3'ds or so scallop-like deal. Sticks out like a sore thumb UNLESS it's been internally balanced and in that case all SB's have full round dampers!
(He, He!! The early lo-po- 265's and 283's only had hubs w/ a ring and a pulley on them.)
BB's, all except the 454 and 502 have round dampers! The 454 and 502 have a big "dog-knot" up inside the back of them that you can feel for by getting down on your back and reaching up behind it and fingering it. You will feel the big "dog-knot" up in there if it has one. (And I've done this to tell a 402 from a 454!!).....
And as a side note, only the 366 and 427 BB early Mark IV engines were tall-deckers! I don't know when GM quit making the older 366 and 427 tall-deck big truck engines, sorry????
pdq67
PS., I want to say that the later SB's are neutral balanced at the damper but external balanced using the flywheel/flex-plates at the crank flange b/c the crank flange is round and has a 1-piece crank seal so can't have a forged or cast balance fan on it like the older engine's 2-piece seal crank flanges have....
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