A friend of mine has a Kenworth T800 with a 3406b 425hp 43mg,thats getting tired , there’s some new 3406C 310hp 41z comming up for auction in a week, is it cost effective to buy one of these C ,s or just rebuild the b, don’t now the differences between the two,thanks in advance
Not much difference between the B and C; wider big end bearings, better head bolts and a few other details. Can we buy the 41Z and make it 425hp, Cmark? Well, it all depends on the two arrangement numbers. Block, crank, rods, liners, head should be ok. Pistons, camshaft, FIP, injectors, turbo would likely need to be replaced/exchanged. If the existing unit is a PEEC engine, it would be a good opportunity to convert it to a manual system.
Personally I would rebuild the MG- If one is to convert a PEEC to manual injection use the 3ZJ pump and advance unit. The 3ZJ had a better advance.IMO Truck Shop