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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: $248.00

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

Select Valve & Spring Combination

36mm Intake, 31mm, Dual Springs, Aluminum Retainers [Subtract $6]
36mm Intake, 31mm, Dual Springs, Titanium Retainers [+$20]
36mm Intake, 31mm, Single, Aluminum Retainers
40mm Intake, 32mm, Dual Springs, Aluminum Retainers [+$62]
40mm Intake, 32mm, Dual Springs, Titanium Retainers [+$84]
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 using aftermarket GX390 style large port casting. Heads are ported, bead blasted, flowed, & milled. Oversize Stainless Valves. Heads can be fitted with either single or dual springs. Single Springs recommended for 306 and smaller cams. Dual for 307 and larger cams.

Includes

  • Ported, Polished, & Bead Blasted

  • Stainless Intake & Exhaust Valves

  • Aluminum or Titanium Retainers

  • Split Keepers

  • HD single or dual springs

  • Valve Spring Shims

  • 3 angle Valve job

  • Milled to spec

Heads are typically built to order, Allow 1 to 3 days to ship

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