isc is located in winter haven. 3mm seals are thick hunks of junk. hurley seals held to 54 psi!!!! on their track car. i use aviation seals and they are wonderfull. thinkk of it this way... a thicker seal is going to hold more heat and dissipate it less, its going to increase chatter on the housings, unless the rotors are well balanced-it won't be able to hit as high of revs or the duration of a high rev. go to www.hurleyrotary.com or the aviation seal website.