Yea are you saying while just driving under part throttle, timing never went above 22? Part throttle should go alot higher. Now 22 wot isn't that low, my old 6.0 ran best at 25 wot. Anyway you look at it, it should at least be in the 13's

 

Wot 22, cruising it would be in the 30's

 

Throwing more timing at it isn't the fix. A 6.0 rcsb running 16.8 has something mechanical wrong but it's just easy to blame the tune. I had a similar experience and got 6 retunes but stayed the same until I opened the valve covers and saw loose rocker. Running on 7 cylinders kills performance. Btw lost 2 sec off quarter with that.

 

I'm not blaming the tune, 5 retuned show it's mechanical. During the cam swap I'm checking all the valvetrain.

 

Lets get a dot 2 dot cam timing pic while your swapping cams..?? Or even a pic of before you take it apart..?

 

good compression and leak down test might help ya also to determine the issue

 

I'm going to get a few pics of the dot to dot, and the timing chain. when I find the prob I will let y'all know no worries there.

 

When the lifter is on the base circle of the cam the pushrod will stick up higher than the rest. You have to pull the rockers off and measure all intake, and exh. Be sure the lifter is pushed down on the base circle of the cam. That #8 plug doesn't look right. Just because a injector is firing doesn't mean it's always good.

 

started the cam swap about an hour ago, just waiting on the crank pulley puller then ill have some pics of the dot to dot and all that.

 

heres a few pics of the dot to dot, looked perfect to me. all the rocker arms were tight and moved properly.