1.3 Billet Roller Rockers, GX390 Item Number: CL-2594 Price: $219.00 Add to Cart Description The CL-2594 is the newly design 1 to 1.3 ratio gauge Billet Rocker Rollers. This rocker setup fits the GX340 and GX390 applications. Accessories ARC 4.41 Billet Rod, Clone 13hp, Honda GX340/390