Just to make somethin clear speciality does not sell rkt860 BB kits the only rkt product that goes with that kit is the head, Kelsey from rkt told me this himself, a friend of mine got the suposed rkt 860 from specialty it it didn't run any better than a stocker ,actually ran worse than mine, he fought all winter trying to get it to work and had no luck. you want a rkt kit buy it straight from kelsey at least you know what you getting, but if you want my honest opinion BB kits are kits are hit and miss.