heres for the guys that dont know, and a few misinformed posts.
-a 12v gear case will not fit a 6.7 block. the block casting is way to large around the pump and pump hits the block. so does the gear case. drill/mill/ tap all you want. if it were me, id wana buy the right parts the first time.
-the correct gear case for a 12v head 6.7 ppump engine can be bought from keating or schied for around $1500. its a bolt on deal and the scheid setup is a bolt on application with stock pump placement. comes with everything you need to bolt on the pump.
- obviously if your running a 6.7 crank you need to swap cam and crank front drive gears for the ppump drive gear to match. simple swap with a press.
-12v rods will work well in a ppump 6.7 engine. no clearance issues.stick them on the standard 6.7 piston and pop em in.
- as far as the 12v head bolting on and lining up, yes, you can use your regular 12v head studs. as far as a gasket, a stock cummins mls layered 6.7 gasket will suffice. oringing is optional. pushrod holes all will line up with rockers. your tappets will obviously need put in the bottom since the 6.7 has no side cover.
- no clearancing should be needed of the head for the injection pump ofv on the return of the ppump.
-as far asthe 6.7 12v production head goes, i would assume its the normal 12v casting. BUT I CANNOT SAY FOR SURE. i havent seen one.
- standard 6.7 bore pistons/std bowl will be fine with the 12v head. no, its not ideal, but will make good power on a budget. ideally, a custom cone angle would be done to the nozzle for the centered bowl.
hope this helps someone.