 The Callaway SS also included suspension, braking, wheel and tire enhancements.The Callaway-designed and built 383 cid engine was based on the Chevrolet Vortec V8 which in final tune produced 400 bhp at 5,250 rpm and 437 lb-ft at 4,000 rpm.It was then claimed as the fastest production ski boat in the world, with production runs limited to only 125 per year.