Cummings Engines Mar 24, 2015 12:23:17 GMT Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by phil on Mar 24, 2015 12:23:17 GMT Anyone have any advice, tips or info on the performance of cummings engines. The 390S we are buying has twin 320hp versions. We only have experience with volvo D4's. Thanks