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I understand that forged crankshafts are generally accepted as "stronger" than billet (machined from solid) cranks. But, I am trying to compile more specific information. Any information sources on comparative features, such as fatigue resistance, wear characteristics, etc.? Thanks!

Buna-N (Nitrile), and Viton[©] are the most commonly found o-ring materials compatible with gasoline. Many of the "regular black" o-rings are butyl-rubber, which will break down in gasoline. Here's a very complete reference...