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GX160s are listed under GX200, Racing Motors Hop Up Kit - GX200 & 6.5 Chinese OHV, Stage 4
For QMA/USAC see or 1/4 Midget Motors

Our Stage 4+ kits allows you to customize a kit for your application. The 4+ kit starts with package similar to that of the stage 3 kit but adds a Ported and Milled Head, stainless valves, billet rockers, and a serious cam package. Options include everything from roller rockers to stroker kits. This kit will allow you to build a motor in excess of 20+ hp

Stud Kit, Side Cover (with solid Dowels) - GX200, 6.5 Chinese OHV, & 212 Predator Engine, Racing, 212 Predator, Modified Level 1
Stud Kit Includes : Side Cover Studs, Washers & Nuts, Solid case Dowel Pins, Mandatory for all HP applications.

6.5 Chinese OHV economically prepared for stock type racing and for off-road applications need more power than stock.

Hop Up Kit - GX340 - GX390, 420 Predators, and 13/15hp OHV, Stage 3 Hop Up Kit- 212 Predator OHV (old style), Stage 1
As step up from the Stage 1, this kit is designed to improve the power for the GX340s and GX390s along with improving the durability.

Basic kit for improving the performance of GX160, 200s, and Chinese 6.5 Engines. Simple to install, you can expect significant performance increases