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Head, Racing, GX390, Small Port, Torquer & Mid-Range, Honda Core
Head, Racing, GX390, Small Port, Torquer & Mid-Range, Honda Core


 
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Heads are custom finished to order and may take 2 to 3 days to ship.
Our Price: $265.00

Stock Status:In Stock

Part #: HEAD-RACING-GX390-HONDA-SMALL

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 [+$89]
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 with Genuine Honda Core
This head uses a Genuine Honda core for better flow, less porosity, and higher strength than aftermarket heads. Head may be fitted with either single or dual springs. Single springs are recommended for 306 and smaller cams; duals are recommended for 307 and larger.
GX390 heads have the options of 36mm, 38mm, or 40mm intakes.
*GX390 heads will fit GX340s.

We offer heads in two port sizes:

  • "Small Port, Torquer" uses small port castings to increase velocity and maximize low-end power at some loss of high-end RPM. These are the best choice for most applications.
  • "Large Port, High RPM" uses large port castings to increase high-end RPM power at some loss of low-end torque and reduced throttle response. They may provide increased cooling for endurance applications.
Product Includes:
  • Ported, polished, and bead blasted head, milled to specs
  • Stainless intake and 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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