Valve Spring Kit, Dual Valve Spring Kit Honda GX390 Predator 420cc Big Blocks

Pair of Dual Valve Springs for GX270, GX390, and 420 Predator

Our dual valve spring rates are as follows:

           Using our spring locator (spring pads will need machined)

68 lbs at 1.200 installed height

150 lbs at .470" valve lift (.730" spring height)

.050" coil bind clearance

Specs using no spring locator with no inner spring step

58 lbs at 1.200" installed height

140 lbs at .470" valve lift (.730" spring height)

.050" coil bind clearance

• Our dual valve spring kit will fit GX240, GX270, GX340 and GX390 engines.