MBRE uses GM Iron engine blocks fully blueprinted machine and balanced assemblies to build our complete engine packages please call for cubic inch and component pricing . These packages are available like our LS engines either completely assembled and dyno tested or just as complete engines . We also offer these packages in the aluminum block versions as well. Complete engines take interaction with the buyer for best results please call our office at 305-884-5368 or email us lmesa@mesabalancing.com.