Jet maniac bb 865cc first bore 7-8 hours. Motor can be bored to 885cc (91mm). Blowsion sleeves,Dasa pistons,JM head custom domes, sbt crank, ported,decked, and epoxied. JM starter and bed plate included. Runs on race fuel only vp c12. You can change the domes and lower the compression to run on pump gas.