the first banshee was a 350 cub (or maybe 4mm cub i cant remember), the second a 10mm cheetah, the triple is a 750 or so on a heavy chassis. the yfz is a stock stroke, stock bore, stock head, stock cam. with a lockup/override and portwork with spray. it was his "medium shot" of nitrous that got him up over the 104mph mark. i have some vids somewhere of some bigger motor yfz's that only trap 75 or so.. if not i can record some more.
the 3.29 was ran with a 20mm on nitrous.