Arctic Cat 858 — 1030cc Big Bore Stroker Kit

$6,000.00 CAD

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Regular price $6,000.00 CAD
Sale price $6,000.00 CAD Regular price

Available fall of  2025!

Our only drop on kit thanks to the Arctic Cat  design!

The Catalyst chassis is so easy to ride and gets up on the snow but felt the engine could use more excitement! This will be worth voiding your warranty!!   Inspired by the legendary mid-2000s big bores, the 1030cc Stroker Kit will bring back that aggressive torque curve, delivering a crisp hit from a standstill and serious pull through the entire powerband. 

We will be receiving production cylinders and parts August of 2025 and start dyno testing.  Aiming to have it on the snow November 1, we will take preorders with no deposit and release the kits when we have enough testing to feel comfortable we have nailed it!

 

Key Features

  • 93mm forged pistons
  • Utilizes stock crank with option to upgrade to Indy Specialties Billet replacement crank
  • Drop on top end – utilizes stock crankcase and crankshaft, no machining
  • Compatible with both boosted and naturally aspirated setups
  • Can run stock injection and air induction systems

 

Option for:

  • Injector relocate blocks with stock throttle body
  • Upgrade to SSI 55mm throttle bodies
  • Pump gas compatible — not our favorite, but it’s doable
  • Testing stock pipe
  • Testing twin pipes
  • Testing Jaws Single pipe kit


What’s Included in the Kit

  • Cast Big bore cylinder 93mm bore 
  • Billet head c/w domes & new bolts & billet water fittings 
  • 2X Forged Piston kits 
  • Top End Gasket Kit 
  • Stainless coated base gasket 
  • New Primary Power Valves and cover to match cylinder
  • SSI air box

Package Price: TBD but budget $5,500.00 CAD


Optional Add-Ons

  • Injector relocate kits for stock throttle body

SSI 55 mm throttle body

SSI ported RAD valve

  • Fuel Inserts:
      - Pump Gas Insert
      - 100 Octane Insert
      - Race Inserts (110–120 Octane)

 

  • Twin Pipes
  • Single Pipe Kit

 

Arctic Cat 858 — 1030cc Big Bore Stroker Kit

$6,000.00 CAD


Contact Info

Phone: 587-802-4031

Email: Dean@upshift403.com

How fast is shipping?

This the depends on the product and time of season. Please inquire for more info.

What's the returns policy?

Generally as long as the product is unused, untampered with, and undamaged we will accept returns. Please reach out to us with photos and information before returning.