looking to find the best big bore stroker kit for hil climb/drag racing

No single builder has a lock on specific big bore parts so the question of "who" makes the best stroker is moot, the components are available to build any combination you can afford. Things like porting and cam choice is where Raptor builders set themselves apart from the others, they all use the same components but the end results can be very different.
The cheapest big bore stroker uses the Hotcams 4mm crank/rod in a 102mm (686) bore for a 720cc stroker. There are more than a few running a +4mm stroker crank/rod in a 105mm (727) bore for a 760cc stroker. Recent talk is a +6mm stroker crank/rod with a 106mm (740) bore for a 800cc stroker, I haven't seen one run yet.

Do you know if those kits would work in a rhino?

Yes, they will work in a Rhino.

not much of a rumor...lol

DaBeechMan - Do you mean the 6mm stroker isn't much of a rumor?

yes sir

ummmmmm......[img]i/expressions/face-icon-small-shocked.gif[/img]

Didn't powroll build one almost a year ago???

Brent at Dirtworx racing which is a local guy built a 6mm stroked 686 whick i think is a 730 and it runs very hard! The only thing he regrets doing is taking out the counterbalancer! the whole bike is a rattle trap now!