YB Cylinder Heads

Smith & Jones – YB Cosworth Cylinder Heads

Manufactured from premium Grainger & Worrall castings, heads are supplied with…….
CNC porting, CNC 4x4 combustion chamber, valves seats, valve guides and cam caps.

Price £4,100.00 + VAT


Available head types:

WRC - (4x4 casting)

  • Typical use - Grp A & WRC Turbo Engines
  • Valve seats for STD YB valves 35mm IN & 31mm EX
  • Valve guides 7mm IN & 8mm EX
  • Inner port sizes – 25.5mm IN & 25.5mm EX
  • Valve spring platform machined for longer valve spring


RS500 - (2WD casting – turbo damper bracket)

  • Typical use – RS500 Race Engines
  • Valve seats for STD YB valves 35mm IN & 31mm EX
  • Valve guides 7mm IN & 8mm EX
  • Inner port sizes - 27mm IN & 25.5mm EX
  • Valve spring platform machined for longer valve spring


290CFM (4x4 casting)

  • Typical use - Turbo engines 600-900 BHP / NA Engines up to 300BHP
  • Valve seats for oversize valves 36.25mm IN & 32mm EX
  • Valve guide 9/32” IN & EX
  • Inner port sizes – 28.5mm IN & 27mm EX


330CFM - (Big-Port casting)

  • Typical use - Turbo engines +1000 BHP / NA Engines +340BHP
  • Valve seats for oversize valves 39mm IN & 33mm EX
  • Valve guide 9/32” IN & EX
  • Inner port sizes – 31.5mm IN & tapered 29mm EX
     

Cylinder heads can be supplied with valve gear and fully assembled if required

Contact S&J to discuss your requirements and current pricing