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  3. HF GX390/420/440/460 Engines
The Predator and Clone Big Blocks are for those wanting big power and torque for UAS Karts, Golf Carts, Mini Bikes and Mud Boats. These are popular with those extreme racers as an inexpensive performance package and those in heavy race machines needing brute power and torque especially down low. These engine range in different displacement based on bore and stroke but share the same architecture.