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[Marks DTM Calib]

Were the cam pullies fitted correctly?

Were the cams fitted correctly (e.g. G cams on the inlets and A's on the exhaust)?

[NiallyV6CDX]

Yes the timing is fine, and the cams were fitted in their correct banks (although I am told the are both the same so would this make any difference to the running of the engine?)

[Andy H]

If one of the cams was far enough out that the valves were still open when the pistons were on the way up the compression test would show a lower pressure (but all three cylinders on that bank would be affected).

The other thing that could cause similar problems is bent valves.

[Entwood]

Yes the timing is fine, and the cams were fitted in their correct banks (although I am told the are both the same so would this make any difference to the running of the engine?)

AFAIK this is NOT correct .. the inlet and exhaust cams ARE different ... if you have all 4 the same it "might" explain the problem .. one set of cam profiles are way out ..

[Marks DTM Calib]

Correct, they are different, the lift is similar but different duration (inlet being longer)

All fololwers are fitted?

If you look down the inlets of the affected cylinders (with the inlet removed), do the inlet valves look ok?

[Marks DTM Calib]

Also, I assume when the cams were fitted that the crank was 60 degress before or after TDC?

[NiallyV6CDX]

Yes, I had a nightmare getting all the timing correct as there is nothing to guide you once the cam wheels are off but got there in the end as yes, had to turn the crank forward to 60deg BTDC.
I'm sure its not the timing thats at fault here because as Andy H said it would come up on all cylinders on the bank if it were, its only on 3 and 6, 3 being the worst.
I have looked down the inlets and all the valves are clean and appear to be closed but the blow back says otherwise.