Home > Hop Up Kits > GX340, GX390, 420 Predator, & 13/15hp Chinese OHV > Stage 4 > 420 Predators
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Hop Up Kit, 420 Hemi, Stage 4 Hop Up Kit, 420 Predator OHV & 13/15hp Clone, Stage 4
Similar to our Stage 3 Kit, but Adds a Ported and Milled Head with Stainless Valves, a Stud Kit, & HD Valve Train Components. This Kits Allows up to 35+ HP.

 		Similar to That of the Stage 3, but Adds a Ported and Milled Head with Stainless Valves, a Stud Kit, and HD Valve Train Components. Allows up to 35+ HP from a 420 Engine.