We\'ve been building 2J motors for 12+ years and know what works! Our SP 3.4L Motor package uses the Brian Crower 3.4L stroker kit (Carrillo Rods)We can also build this motor using Billet main caps for an additional charge.This is a fully assembled motor from us. We do require a core block, otherwise there is a charge for no core.Package IncludesBC 3.4 Kit (Carrillo Rods/CP Pistons)Machined/Prepped BlockSP Modified Oil PumpARP Main StudsAssembly of shortblock