Could you weigh all the counterweights and flywheels that you have?
When I get home, I will get you a weight on an S5 counterweight, an S5 flywheel an S4 counterweight and an S4 flywheel. This should help you with the process of elimination.
I wish I could go out and weigh them right now (that would mean that I was home and could be working on my car).
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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