I READ SOMEWHERE ABOUT SHIMMING THE HEAD AND PUTTING 670 DOUBLE RING PISTONS IN IT .THEY SAY THEN THE SLED REALLY COMES TO LIFE.ACTUALLY THEY SAID IT IS FASTER THAN ASTOCK 8000MXZ.HAVE ANY OF YOU GUYS TRIED THIS?

We'll see? I'm in the process of putting one together.

HEY HILL POUNDER WHAT SRE THE PARTS YOU ARE USING? AND WHAT DO YOU KNOW ABOUT HORSE POWER ETC THANKS

Storm, Check your PM. As far as being faster than a 800? Most our contests are marks on a hill and yes a good 700 will be right there with a 800. But do the same stuff to an 800? just can't get around the "no replacement for displacement" rule when you add gravity to sled and rider weights.