Help please 6nz74066

To get up to that HP you will more than likely have to do quite a bit of modifications, injectors, possibly turbo. I would leave it alone, get her mechanically sound and go make some money. Unless you need that kind of HP, but then why did you buy the motor? I remember when a well tuned Cat 425 was the big boy on the block.

 

CAT can do a software upgrade, IDK if they stopped doing that or not, call them and find out.

 

Good motors, no denying that. Just make sure on the parts, a lot of crap stuff out there that you do not want near that motor.

 

Just dial in that engine with a good CAT mechanic. The more power you make the faster the engine will wear out. And the faster your wallet will be empty when you use a lead foot.

 

Personally, with a good tune, I would leave it be. I have a 600hp factory Cummins under my hood, and have it set at 450hp and 1650 on the torque. It pulls just fine, and the best part is the fuel economy.

 

In 07 I bought a new truck.6nz @475 took it to CAT and the flashed it to 625 and it remained under full cat warranty, however I heard that they no longer do that, IDK if it's all engines or just new ones.