paul- i cannot shed any useful light for you, but i can recommend a good clutch. the textrilia seems to own the ls1 clutch market right now. i learned something after running the spec 3, you get what you pay for. sure you can get a spec or a ram for half the price, but your gonna eventually have to replace it. we're both running pretty big cam setups and we both drive our cars pretty damn hard. i think its worth to reassurance to step it up to a great clutch. didnt you a break two different 10 bolts when you were stock?