Description

Pro Class 408 RS

6.0L LQ4 Engine | Ideal for 1200 HP builds

• We start with a seasoned 6.0 LQ4 Engine
• Bored and Diamond Honed to a 408 ci
• CALLIES Apex Forged 4340 4.000 in. Stroke 58 Tooth Crankshaft
• ARP Main Bolts
• Callies, Compstar 6.125  Rods with ARP Hardware
• Forged Mahle,  DSS, JE or Wiseco  4.030 Pistons
• Cometic MLX Head Gaskets
• ARP Head Studs
• NEW LS3 style Rectangle Port Head Castings with Custom Powertrain Port work to improve flow
• Manley Extreme Duty Valves
• CHE Precision Shaft Mount Trunnion kit
• Melling High Volume M365 Oil Pump
• Includes Factory timing cover and truck oil pan ( Aftermarket options Available at checkout)
• Safely Rated For Turbo or Supercharger Applications up to 1200 HP
• Your specific power ratings will depend greatly on setup and tuning
• This engine must have custom tuning performed in order to operate properly!!
• This engine comes with a 6 month warranty  from date of purchase against manufacturers defects inspection of engine upon failure will be required See warranty for details***
• Engine is designed for use in off road non emission compliant vehicles.

**** Also Look at our Line of Performance Transmissions to go with the new engine!!  Our Street and Pro Level Units are available Now *****

Featured in the 2026 season in  our burnout truck (Tweedster) as well as the well known Frosty Ice Cream Truck