Here are the 2019 Bad Boy Mowers IMCA Modified/Jet Racing Central Region transition rules: Weekly racing begins April 6. May run a reverse mount aluminum bellhousing with starter. If running any motor combination other than IMCA you must have 25 pounds in front of motor plate. No Schrader valve shocks. Must have Hoosiers on rear. American Racers can be utilized on front until May 1.