BOLD MAGENTA part numbers are new for 2026 PARTS-UNLIMITED.COM 2026 | SNOW ENGINE ENGINE 548 DESCRIPTION ALTITUDE (FEET) HP INCREASE PART # Power dome billet heads All elevations 6 hp peak/6.9 hp midrange 0930-0179 POWER DOME™ BILLET HEAD FOR 850 AXYS MODELS 19-25 •Billet aluminum construction •Dramatically increased combustion efficiency •Radical combustion chamber design provides more horsepower with less chance of detonation •For low altitude operation with stock or modified engines FITS MODEL BORE (MM) CYL. TYPE PART # ARCTIC CAT 600 L/C Mountain Cat EFI 01-05 78 AC FL1271 600 L/C Pantera EFI 02-05 (cylinder #88BA) 78 AC FL1271 600 L/C ZL 01-03 78 AC FL1271 600 L/C ZR 01-02 (bridged exhaust) 78 AC FL1271 800 L/C Crossfire 8 07-09 85 AC 0931-0531 800 L/C F8, M8 HO 07-09 85 AC 0931-0531 800 L/C LXR, Sno Pro 07-09 85 AC 0931-0531 POLARIS 550 F/C Edge LX 07-08 73 CI FL1251 550 F/C Indy Classic 02-06 73 CI FL1251 550 F/C Indy Sport Touring 00-04 73 CI FL1251 550 F/C Indy Super Sport 99-07 73 CI FL1251 550 F/C Indy Trail RMK 99-06/Trail Touring 00, 02-06 73 CI FL1251 550 F/C PROX Fan 04 73 CI FL1251 600 L/C Classic Touring 02-05 (cylinder #3021333) 77.25 AC 0931-0532 600 L/C Dragon SP 09 (cylinder #3021333) 77.25 AC 0931-0532 600 L/C Edge 04 (cylinder #3021333) 77.25 AC 0931-0532 600 L/C Fusion 06 (cylinder #3021333) 77.25 AC 0931-0532 600 L/C HO Edge 02-12 (cylinder #3021333) 77.25 AC 0931-0532 600 L/C Indy 13-16 (cylinder #3021333) 77.25 AC 0931-0532 600 L/C PROX 03-04 (cylinder #3021333) 77.25 AC 0931-0532 600 L/C RMK 02-16 (cylinder #3021333) 77.25 AC 0931-0532 600 L/C Rush 11-16 (cylinder #3021333) 77.25 AC 0931-0532 600 L/C Switchback 04-16 (cylinder #3021333) 77.25 AC 0931-0532 600 L/C XC SP 02-05 (cylinder #3021333) 77.25 AC 0931-0532 700 L/C Edge 04 81 AC FL-1221 700 L/C Indy Classic 00-04, PROX 03-04 81 AC FL-1221 700 L/C Indy SKS 97 81 AC FL-1221 700 L/C Indy SKS 99-03 81 AC FL-1221 700 L/C Indy XC, RMK 97-05 81 AC FL-1221 700 L/C Indy XC SP 99-05 81 AC FL-1221 700 L/C Switchback 04 81 AC FL-1221 800 Liberty Mono-Block L/C CFI 08-11 85 AC 0931-0533 800 Liberty Mono-Block L/C Dragon SP 09 85 AC 0931-0533 FITS MODEL BORE (MM) CYL. TYPE PART # POLARIS (CONT) 800 Liberty Mono-Block L/C IQ 08-10 85 AC 0931-0533 800 Liberty Mono-Block L/C RMK 08-11 85 AC 0931-0533 800 Liberty Mono-Block L/C Rush 11 85 AC 0931-0533 800 Liberty Mono-Block L/C Switchback 09-11 85 AC 0931-0533 SKI-DOO 500 L/C Formula 97-98, 00 (Rotary valve motor) 69.5 RS 0931-0312 500 L/C Formula Deluxe 97-98 (Rotary valve motor) 69.5 RS 0931-0312 500 L/C Formula Deluxe 99-00 (Rotary valve motor) 69.5 RS 0931-0312 500 L/C Formula Deluxe 01 (Reed motor) 69.5 RS 0931-0481 500 L/C Formula SLS 96 (Rotary valve motor) 69.5 RS 0931-0312 500 L/C Formula Z 99 (Rotary valve motor) 69.5 RS 0931-0312 500 L/C Grand Touring 96-00 (Rotary valve motor) 69.5 RS 0931-0312 500 L/C Grand Touring 01-3 (Reed motor) 69.5 RS 0931-0481 500 L/C Legend 02-03 (Reed motor) 69.5 RS 0931-0481 500 L/C MXZ 98-99 (Rotary valve motor) 69.5 RS 0931-0312 500 L/C MXZ 00-03 (Reed motor) 69.5 RS 0931-0481 500 L/C MXZ Trail 01 (Reed motor) 69.5 RS 0931-0481 500 L/C Skandic Wide Track 99-00 (Rotary valve motor) 69.5 RS 0931-0312 500 L/C Summit 96-99 (Rotary valve motor) 69.5 RS 0931-0312 550 F/C Expedition Sport 05-20 76 RS 0931-0309 550 F/C Freestyle 07-09 76 RS 0931-0309 550 F/C Grand Touring 03, 10-15 76 RS 0931-0309 550 F/C GSX 05-10 76 RS 0931-0309 550 F/C GTX 05-09 76 RS 0931-0309 550 F/C Legend 03-04 76 RS 0931-0309 550 F/C MXZ 03-13 76 RS 0931-0309 550 F/C MXZ TNT, Sport 550F 10-19 76 RS 0931-0309 550 F/C Renegade Sport 10-19 76 RS 0931-0309 550 F/C Skandic 04-20 76 RS 0931-0309 550 F/C Summit 03-11 76 RS 0931-0309 550 F/C Tundra LT, Sport 12-20 76 RS 0931-0309 550 F/C Type 552 03-20 76 RS 0931-0309 593 L/C MXZ 600 99-16 76 RS FL-1255 CYLINDER SLEEVES •Re-sleeve worn or seized cylinders •An economical and available solution for riders, racers and engine builders everywhere •Centrifugal castings used in these sleeves are made from an alloy of carbon, chrome and molybdenum of 200 Brinell hardness, ensuring ease of installation, trouble-free boring and a dependable, long-lasting engine •Sold each CYLINDER TYPES • AC – Original cylinder bore is alloy chrome-plated, Nikasil® or electro-fused; cylinder must be bored to accept new sleeve •CI – Original barrel has a cast-in iron liner in the cylinder; liner must be bored out completely (do not try to push out the cast-in liner) •RS – Original barrel has a replacement sleeve; heat cylinder to remove old sleeve; reheat cylinder to install new sleeve 0931-0312 FL1271
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