S54 Cylinder Head Stage 3

Our Stage 3 head builds on the stage 2 with the addition of CNC porting to both intake and exhaust ports for maximum performance and power in harsh applications.

This head is for someone looking to run constant high engine speeds in a race application or street and feature a full Ferrea valvetrain able to run RPM's in excess of 8500 with a sense of reliability. These include titanium retainers and should be inspected seasonally for wear in severe applications and yearly for street use.  

Our Stage Three Cylinder Heads feature the following:

• Full Disassembly & Cleaning 
  • Inspect & Blueprint All Components For Irregular Wear
• Leak and Crack Test Pressure Test
• High Performance Five Angle Valve Job
• Trueness Checked & Resurfaced Mating Surface
  • Surface Finish/Roughness Exceeds OE Spec
• Attention to Potential Hot-spot Areas and Chamfering
• Unshroud the Valves in Combustion Chamber
  
• New OE Valve Stem Seals
• Ferrea Dual Valve Spring Set w/ Ti Retainers
• Ferrea Intake/Exhaust Valves 
• Manganese Bronze Valve Guides
• CNC Porting of Intake and Exhaust ports for the perfect and consistent port size for a nice even flow into the cylinder and a flow bench proven gains on the exhaust side

Type/Material/Application: Dual Spring - Endurance - Special Alloy
Outside Diameter: 20.8 mm/28.0 mm
Inside Diameter: 16.51 mm/20.8 mm
Seat Pressure: 85 lbs @ 41 mm
Open Pressure: 185 lbs @ 31 mm
Rate Inch: 254 lbs
Coil Bind: 26.5 mm
Max Net Lift: 14.0 mm

Exhaust Valve
Head Diameter: 30.5 mm
Stem Diameter: 5.96 mm
Overall Length: 119.2 mm
Tip Length: 1.1 mm
Reference: 30 Degree Flo. Stock size. Triple Radial Groove. Super Alloy

Intake Valve
Head Diameter: 35mm
Stem Diameter: 5.98mm
Overall Length: 117.6mm
Tip Length: 1.2mm
Reference: 19 Degree Super Flo. Stock size. 30 Degree backcut. Triple Groove

Valve guides and valves will be checked, if replacement is needed it is done at additional cost of $25 per valve guide.

• A Core cylinder head is required for all head work - Cores are available for exchange service