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I ran my 440ex hard as f' for atleast 2.5yrs with just regular oil changes. Never head a blown anything, never had a reliability problem period. I just used the basic IMS Kit with stage 2 cam and titanium valve springs. It was fast, probably 48-52hp. definately a banshee beater up until the banshee hit 6th gear on the flats ofcourse but hill shooting was it's specialty. gear down with 10 paddle haulers ftw
426 would be my pick they can be tuned in real well and still be pretty reliable, ive seen a few of those that flat out hauled a$$, the 440s "can" also be good but they are prone to head gasket probs and overheating if not done right, some people have 440s that are just fine with no problems its just that they are known to run into problems sometimes with 440s.
2001 Banshee: Bored .020 Over, Vitos SS Pistons, Toomey TR-6 Pipes, K&N Pro Flo,Pro-Design Head 21cc domes,+4 Timing, Modded Shift Star...Etc etc.
2003 Banshee: Bored .080 Over, Wiseco Pro-Lites, F.A.S.T. Coolhead 21CC Domes,28 PWK Carbs, DMC 916 Pipes, Ported, Hotrods True/Weld Crank, VF4 Reeds, +4 Timing, UM Alum Airbox, K&N Pods /w Outerwears....blah blah too much to list.
2005 Rancher 350 4x4