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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: $259.99

Stock Status:In Stock
Part #: HEAD-RACING-GX390-HONDA-SMALL

Select Valve & Spring Combination

36mm Intake, 31mm, Single, Aluminum Retainers
36mm Intake, 31mm, Dual Springs, Aluminum Retainers [+$6]
36mm Intake, 31mm, Dual Springs, Titanium Retainers [+$34]
40mm Intake, 32mm, Dual Springs, Aluminum Retainers [+$79]
40mm Intake, 32mm, Dual Springs, Titanium Retainers [+$99]
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

    These heads use Genuine Honda cores (these flow better, are less porous, and stronger than Aftermarket heads). Heads are ported, bead blasted, flowed, & milled. 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.
    GX390 Heads have choice of 36mm Intake, 38mm or 40mm intakes

    We offer heads in two port sizes
  • The "Small Port, Torquer" uses small port castings to increase velocity maximize low end power at some loss of high end rpm. IT IS BEST CHOICE FOR MOST APPLICATIONS.
  • We also offer a "Large Port, High RPM" head (this one) use large port castings to increase hign rpm power at some loss of low end torque and reduced throttle response. They can provide increased cooling for endurance applications.

    390 heads will fit 340s.

    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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