When I was fabing things in the industrial world, we often used liquid urethane for rollers, gaskets and vibration mounts. I'm building a damper/pulley for my 230. It incorporates the outer ring from a vortec 4200 with the shortened inner hub of an 8 inch SBC damper. Urethane rubber comes in many harnesses. I will sandblast the parts, prime them and vacuum degas before applying a slight pressure till it sets then heat treat it. I was trying to understand the different harnesses and their relationship to RPM. All this to install an Eaton M90 on a 230. The 6 rib belt should help dampen things down as well. I'll check the ATI site, though I will have a hard time finding data on the hysteresis properties of urethane and how it differs from compressed rubber. Thank you gents
