all you need to do is get the waterpump cover off a newer bigblock polaris motor ex 700 or 800 and it will work thats what i did im putting a 98 600 into an 02 prox chassis
1990 indy trail bored.20over, ported and polished, cluched and geared, chaincase/brakes/jackshaft from 93 xlt, headlight cover, teather, some custom painting, black skid plate, blue running board trim, fox shocks, blue/gray powermadd handguards, 2 in powermadd riser, fly bars/barpad,blue leds(underglow),1 in lug track, teather mount from a 96xcr440,blue guage bulbs, blue c&as, xtra 10 rear, and edge seat and tank.
2005 xcsp 600,chrome windy,stripped decals,3.5 inch rox riser,white powermadd handguards,white c&a ultra 3 skis 6in shapers,camoplast cobra,slp can,fly bars/barpad,xeon headlight bulbs,rsi barhooks,odi grips,light blue clutch spring,slp vents,black headlight cover,billet wheels,rydefx clicker,