F250 compression #s

[formula29]

I just ran the motors while watching the yds, it showed port cam intake timing at +12 degrees and the starboard was showing -2 degrees does this look right rodbolt?

[formula29]

I just came in from verifying the camshaft timing marks lined up to rule that out. I was kind of leaning toward that maybe the cam timing being off either because of the vvt or possibly a tech missed one tooth on the install of the belt, I tend to over think things, if the numbers were all other the place it would make sense that it was carbon or valve issue or worn rings, it is just strange to me that one whole bank is evenly 25 pounds lower that the other on both engines? I do thank you for your time to respond to my questions rodbolt, I value an experts advise,

[rodbolt17]

could be a lot of things,cam timing,cranking speed.
that's why I don't do compression tests.
I do leakdown tests.

did one on a master craft yesterday with an Ilmor 5.7.

compression test "said " all was good.

I followed with a leakdown test.
engine FAILED.
1 80%
2 20%
3 85%
4 85%
5 85%
6 40%
7 85%
8 40%
#1 had 180 PSI on the pukey test.
the leakdown showed it was not only incapeable of sealing it was leaking past the intake valve.
and that is why I don't normally compression test a 4 stroke.
the compression tested good, the engine is very sick.

[formula29]

Thanks rodbolt, I will do the leak down next, if it needs a valve job its not the end of the world but if its the rings I would be inclined to return the motors, I am still wondering why both engines have the same unequal numbers between left and right bank? that part doesn't make sense to me.

[rodbolt17]

compression test on that motor is as much value as a teat on a steer.

do a leakdown.
do a good treatment with the YIES treatment, NOT combustion chamber cleaner or ring free.
re run the leak down.
takes maybe an hour.

[formula29]

I need a little help from a Yamaha tech, but I'm afraid I know the answer. I just bought a used set of 2007 f250's aprox 900 hrs, they run fine mostly but the strange part is both motors have low compression on all 3 starboard cylinders, both engines have 195 psi on the port banks, and 170 psi on the starboard banks? test was done with throttle open, this cant be normal for these engines is it? I am aware that a leak down test will pin point where the problem is I just want to hear if this is common or not, I bought them from a reputable dealer and they told me they would take them back but if its normal so be it, its just weird to me that both engines are identical. thank you for any replies.