You will need atleast the billet ridged hub SFI dual disc to be doing much sled pulling (part number NMU70G56DDB). We do not recommend sled pulling on a nodular iron sprung hub dual disc. Keep in mind the ridged hub will not allow you to idle as much like a sprung hub nodular iron style clutch would. This is due to the reverse engine spike wearing out the center hubs.
Another alternative would be the street triple ceramic. This clutch is inserted, SFI approved, and light on peddle pressure. The drive-ability is going to be alot more forgiving than the ceramic dual disc. The plus sides are less peddle pressure and the ability to hit higher horse power numbers without worrying about having to light of a clutch.
Your always more than welcome to call me here at the office and ask more questions if needed. If I can't answer them I will find someone that can. (888)682-5247 or (940)327-0682.
Hope this helps, thank you for the interest in our products.
Best Regards,
Heath Huddleston
Valair Clutch Sales
Thank you for plugging our completion in the VALAIR Section. Keep up the good work...........:doh: