I have a 96 xlt rmk that I just put triple pipes on and a 151 track does anyone know if these engines are still reliable after being bored ported etc. or should I just stick to bolt on mods? Thanks for your help.

send the cases and crank to slp for a bearing mod and welding.

Also what kind of horsepower do you think I can get out of this and still be reliable. I would like to have between 130 and 140 do you think that is too far off?

or lool in to this

http://www.snowmobilefanatics.com/forum/to...?TOPIC_ID=28549

thanks for the site xc special

Make sure before any mods are done to beef up the crank bearings.........xlt's weren't meant to spin @ 9300+ rpm's.............don't expect to get 130-140hp.........be happy with 120 reliable hp...........remember these only made about 90 hp in stock form..........have fun & take time to make sure everything is done correctly...............