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Head, Racing; GX390, 420cc, & 460cc; Aftermarket Core
Head, Racing; GX390, 420cc, & 460cc; Aftermarket Core


 
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Heads are custom finished to order and may take 2 to 3 days to ship.
Our Price: $258.00

Stock Status:In Stock
Part #: HEAD-RACING-390-CLONE

Select Valve & Spring Combination

36mm Intake, 31mm, Dual Springs, Aluminum Retainers [+$4]
36mm Intake, 31mm, Dual Springs, Titanium Retainers [+$33]
36mm Intake, 31mm, Single, Aluminum Retainers
40mm Intake, 32mm, Dual Springs, Aluminum Retainers [+$61]
40mm Intake, 32mm, Dual Springs, Titanium Retainers [+$81]
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 (Not Recommended)

Qty:
Description -
 

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

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.

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