Cummins Engine Stand $ 435.00; 2000-2010 Chevrolet and GMC Cummins Conversion Motor Mounts $ 388.00; Latest News. New Products: Diesel Swaps! Everything You’ll Need to Pull Off a Diesel Conversion, Plus a Little Motivation. Swapping a 5.9L Cummins into A 1973 to 1991 Suburban; SEARCH you guys are all wrong! the ifs works just fine- this is from the horses mouth (my brother and i) that a 6.5 to cummins conversion is doable and we have done just that in my brothers 99 k2500 ccsb ! the '98 12 valve motor clears the ifs crossmember just fine, the firewall/trans tunnel needs slight massaging with a BFH:nunu:, the core support needs alot of trimming for intercooler, wiring is a ... If doing an engine conversion, the engine being used will have a 12 volt starter, relay, etc. If simply converting a stock M38A1 to 12 volt, you will have to get the 12 volt civilian starter, distributor, and ignition coil. Gauges are a little more of a problem on 24 to 12 volt swaps.