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Ready-to-Go Race Head for GX390, 420cc, and 460cc
Ready-to-Go Race Head for GX390, 420cc, and 460cc
  1. Ready-to-Go Race Head for GX390, 420cc, and 460cc
  2. Ready-to-Go Race Head for GX390, 420cc, and 460cc

Ready-to-Go Race Head for GX390, 420cc, and 460cc

Price range: $75.00 through $101.40

Head | Guide | Hotrod

Uses aftermarket GX390 style large-port casting. Heads are ported, bead blasted, flowed, and milled. Heads can be fitted with either single or dual springs. Single springs are recommended for 306 and smaller cams; dual springs are recommended for 307 and larger cams. 

Choose a 36 or 40mm Intake Valve, comes with 32mm Exhaust Valve.

Increased milling can increase compression, but at the expense of reliability. ** .120 Not Recommended.

Product Includes:

  • Ported & Bead Blasted Head, Milled to Specs
  • Oversize Stainless Intake & Exhaust Valves
  • Aluminum or Titanium Retainers
  • Split Keepers
  • HD Single or Dual Springs
  • Valve Spring Shims
  • 3-Angle Valve Job 
Select Valve & Spring Combo

36 Intake 32 Dual Springs Alum Retainers [+$4], 36 Intake 32 Dual Springs Titan Retainers [+$34], 36 Intake 32 Single Alum Retainers, 40 Intake 32 Dual Springs Alum Retainers [+$61], 40 Intake 32 Dual Springs Titan Retainers [+$88]
Select Amount to be Milled

Do Not Mill, Mill Head .025", Mill Head .050", Mill Head .065", Mill Head .080", Mill Head .100", Mill Head .120" **

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