Big Bore Cases Print


STD 4.25 - 4.50" Big Bore Engine Cases

If you're looking to build the ultimate big bore motor, STD is again the best place to start! Our new 4.25" Big Bore Engine case Assembly continues our standard for the world's strongest engine cases. Whether your're building the world's ultime street engine or a nitro burning drag bike, STD offers the high strength rated case on the market. Cast from aerospace quality 355 T6 "A" prime alloy with a tensile strength rating of 45,880 psi, the highest rating of any aftermarket cases. Special options include even larger bore sizes up to 4.5" diameter, as well as raised deck heights up to 1.0" over stock. Call for details and pricing.