I think the rotating assemblies are completly different between the srt6 and NA crossfire. thus why are there two different crankshaft part numbers for the m112. would be awsome if somebody could blueprint the cranks and rods.
the srt6 rods might also be stronger and ofcourse piston is different.

but both rotating assemblies are forged parts

oh yeah check out project chromedome over at mbworld, some guy went nuts and disassembled the manifold for porting polish, and some homebrewed velocity stacks, he says it pulls nicely with these mods. not bad for 25 hp https://www.crossfireforum.org/forum...782#post227782