Rebuild time

[Rawze]

(10-07-2018 )Rtrucking Wrote:  ... cm870 565 hp 13 speed 3.70 rears ( started out 475hp ...

This throws a red flag to me towards programming. Many of those piss-poor deel;te shops will use programs of higher HP with a lower HP spec engine. The problem is that there is different hardware and even different injectors inside different HP engines. The CM870's in particular, unlike newer engines, also have variation in cam offsets when build based on ser# ranges and CPL. Makes them even more susceptible to problems when not using the exact program based on its data-plate. - Use a program (demandated or not) that does not belong to the hardware you have and some of the efficiency takes a dump because the computer is assuming it has the different hardware or different cam offsets.

The correct thing to do is only use the program designed for that model and ser# engine. Either only use a program that has been gone through to ensure 100% compatibility, or better yet, change the torque and hp from within the correct program for your engine. 99% of the time no one does this. They just dump in a higher HP factory program that they they guessed at, and went from there. - Not good.
reference: http://rawze.com/forums/showthread.php?tid=1

some info on cam offsets...
http://rawze.com/forums/showthread.php?t...6#pid29926