370+ HP on Pump Gas. No Sleeves. No Compromise.

This is the pinnacle of the F-series platform — the result of years of R&D, testing, and refinement. Built in-house at Charper Built, this naturally aspirated monster redefines what’s possible with Honda’s engineering.

• Over 370 horsepower at the crank
  
  

• 300+ WHP on pump fuel
  
  

• No sleeves – NSC-plated OEM aluminum sleeves, no distortion or cracking
  
  

• Rev-happy, durable, and streetable
  
  

Base Engine Package Includes:

• NSC plating on customer-supplied block – bored and honed for 89mm
  
  

• URGE Halo Stroker kit w/ WPC-coated pistons
  
  

• Chamber-modified head for 89mm bore
  
  

• WPC performance bearings, Toda HD chain, and Toda tensioner
  
  

• ARP head studs, full gasket/seal refresh
  
  

• Oil pump porting, cleaning, and full longblock assembly
  
  

Pricing (Customer-supplied core):

• $10,950 – 2.3L, 10K RPM (requires F22 crank)
  
  

• $11,750 – 2.5L, 9K RPM (includes new modified K24 crank)
  
  

Timeline: 3–4 months turnaround
Shipping Estimate: ~$750 round trip (continental US, block + head + crank)

Core Charges (if no customer-supplied parts):

• $3,500 – 99mm motors
  
  

• $5,000 – 90.7mm motors (includes rare F22 crank)
  
  

Aesthetic & Recommended Options:

• $200 – Engine painting
  
  

• $150 – Valve cover refresh
  
  

• $125 – New girdle, oil pan, chain case bolts
  
  

• $225 – ARP flywheel bolts & spacer
  
  

• $425 – Fluidampr harmonic balancer (highly recommended)
  
  

Performance Add-Ons (Discounted when bundled):

• $1,150 – Intake/exhaust manifold port matching, quench pad optimization
  
  

• $1,650 – Velocity Headwork
  
  

• $350 – Steel valves (choose steel or Ti)
  
  

• $1,400 – Titanium valves with lash caps (required >9K RPM)
  
  

• $1,300 – Jerk stroker or 10K-spec cams (includes degreeing)
  
  

• $500 – Ultra valve spring kit
  
  

• $150 – New AP1 keepers (required for upgraded valvetrain)
  
  

Intake/Exhaust Options:

• $1,500 – Unicorn Header w/ 2.5” collector

  • +$200 for 3” collector
    
    

  • +$1,200 for superlight 321 stainless version
    
    

• $1,950 – Sonic ITBs
  
  

  • +$350 – MAP block
    
    

  • +$200 – Filter kit
    
    

• $600 – ID1050X injectors
  
  

Dry Sump / Oil System (Optional):

• $3,900 – Perpetual dry sump system (requires Fluidampr)

• $1,800 – Oil tank, radiator, and cooler package

• $300 – Oil lines

• $300 – Peterson oil line filter

• $325 – Optional AC/alternator bracket