4 Piston Racing 37mm Intake Valve R40 and a K20 TURBO Race

and a K20 TURBO Race Engine on the back

FX250: 08520-HD0F

Dedicated Grudge Race / Street Race

Install Ferrea Competition Plus Valves and a Ferrea Valve Spring Kit for added durability at high rpm

super-alloy field

4 Piston Racing 37mm Intake Valve R40 and a K20 TURBO RacePrice is per valve! Introducing the only off the shelf 37mm 50 degree intake valve for your K Series engine. Other aftermarket valve designs actually flow less than the OEM Honda valve of equal size. This valve flat out flows! Up to 7 cfm gain per valve over the same size 45 degree off the shelf valves and 25 cfm more than a stock size 45 degree valve. This valve also features a dished head for reduced weight, 7 grams lighter EACH than the 37mm ST