question on phenolic spacers

Soi should ditch the spacer? i certanly ccan not afford to lose any torque at all because my engine is in a 4 wheel drive truck. I had always heard they had torque but who really knows untill you throw it on the dyno right? i guess i will go run it and see how it is and then run it with it off and see how it is and hopefully i can tell a difference.