I'm looking at a 94 truck with a 12V 5.9 CTD and was wondering at what RPM the torque and HP peak happens.
I've heard 230HP is this correct?
And what is the max RPM anyone should turn one if you want max life?

 

I believe it is 215 peak HP @ 1600 RPMS stock. I pretty sure, but could be wrong, I'm sure someone else will chime in and correct me if I am wrong....

 

the 94 is rated at 160hp, the rpm's are limited to 3000rpm, but will start to defuel around 2300, under 2300 is where you have full power, as far as rpm's... you wont hurt that engine at any rpm, i twist mine up to 4000 rpm's with over 200,000 miles