Our new Hayabusa Billet Block is designed for motors running dry as they have no water jackets. Made of aircraft billet aluminum these high quality blocks add rigidity to the entire engine. The stud holes are sized for ½” cylinder studs, but can also be used with 10mm studs. The Hayabusa Billet Blocks are available in a ready to plate 81mm bore size or completely finished and plated in 81mm, 83mm, or 84mm. We also offer special order 85mm or 86mm with offset bores and taller deck heights.