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Ready-to-Go Race Head for GX390, 420cc, and 460ccUses 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.
Product Includes:
Ported, Polished, & 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
*Note: Heads are typically built to order. Please allow approximately 1-3 days before shipping.