A 6nz are one of the best electronic engines Cat made. What is the horse power and torque???? As a cat tech I would keep the 6nz but compare specs. be for you do something you regret

Idk you can make real good horsepower out of the c15 id go that route before trying to do a swap but I will say I love the 3406b!!

we get that all the time with mechanic guys, but a 6nz c15 is different then a bxs or mxs c15 and all of them are different from a mechanic. electronic engine has as much or more to offer then a mechanic. I have ran power checks on both on a dyno. Mechanic guys screw in the fuel setting screws on the pump and think all the black smoke coming for the pipes is power. No it is money, all that black smoke is unburn fuel and then they wonder why they have overheats or burn holes in pistons.
Mechanic engine can not get the mpg that a electronic engine can get. the problem we get from guys that switch from a mechanic to a electronic engine is that they think they have to rev those rpms out to max before shifting and the new electronic engines have lower torque curves then mechanics for better mpg. I have not seen an a,b,or c that can offer up to 625hp

Burned pistons are the biggest problem of a turned up mechanical

Originally Posted by little cat 500

any body ever done this i have a 6nz c15 just not in love with it my brother has a 3406b never has much trouble with it and pulls as well as my c15 was thinking of droppin a b in my 9900 theres nothing wrong with the c15 i just think it should pull alittle better

talk to haney and you wont let anybody pry that 6nz from your cold dead fingers!!