4P Pro 163 CNC Head

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  • Regular price $1,850.00
Shipping calculated at checkout.

Note: Fits PRB Type S K20A2 head, RBC Civic Si Cylinder head, RSP Cylinder head, and PPA and PPL K24A1 CRV heads. Does not fit in RBB TSX castings.


  • CNC Ported intake and exhaust ports
  • OEM Guides left in for porting 
  • Oversized Intake Seats (8) 
  • Precision CNC valve job using the latest NEWEN Fixed Turning technology
  • Resurface
  • Valves Included!!

Recommended Use

  • All Motor Street 
  • USAC Midget
  • High HP open class Road Race
  • 2.4L+ Displacement Naturally Aspirated Engines 
  • E85, Methanol, Gasoline
  • Not recommended for high boost applications, but some turbo cars run them with HUGE success.
  • If you are competitively racing and you are running one of our competitor's heads, make the switch and let the results do the talking

Features & Benefits

  • V2 Pro 163 Started 11/10/2018 and is 400 CFM and a new intake design.  All heads prior to that are V1.
  • Slow-cut precision 5-axis cnc porting, second to none on machining quality.
  • Utilizes a 4 Piston 50 degree 37mm valve which flows better and weighs 7 grams less per valve than other 37s on the market.
  • Precision CNC valve job using the latest NEWEN Fixed Turning technology
  • Full length bronze manganese guide for valve stability.
  • Our intake port has very little turbulence and great velocity when compared to our competitors. You can hear the difference on the bench!
  • Unique power producing exhaust port design.
  • Our heads are all shipped with installation tips, a sheet of desired clearances for setting up your engine, and a flow chart from your head.

All heads require a core! You can send us your head, or purchase one from us at the current market price.