D&D Racing made some monster triple engines at one time. 1700+cc depending on the cylinders used with a custom crankcase casting. Made some big twin big bores as well. They are still in business, but those type of engines are not on their website anymore.
Speedwerx used to have big bores that they don't do anymore.
Cutler's Performance Center (CPC) made some big bore engines, pipes, etc. too at one point, but not supported anymore. Dad still has one of their 1300 twin kits on a M1000.
Black Magic Motorsports/Racing was another big player in the Cat world at one time that is now gone.
Black Magic catalog 2007 for nostalgic snowmobile users
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Nostalgic Black Magic catalog 1992
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At Iantomasi Track N Trail we specialize in Performance Engine Packages and we strive to provide the best level of service to each and every customer! We offer an exstensive range of engine builds, upgrades and maintenance services for all makes and models.
www.iantomasiracing.com