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[05omegav6]

To be in the cylinder, it has to be either from summat always present... valves, pistons or plugs, or summat induced, ie in via the inlet tracts...

Anything else such as timing gear would remain on top of the head... so any cam or lifter damage would be due to debris fouling the exhaust valves on the way out. Be interesting to see what they look like

[JamesV6CDX]

Ref the piston Kevin - I thought that too, however spinning the crank slowly, they all appear to look like that, as they come up from the bottom..

A bit of oil also went into the holes before the next compression test, which didn't affect results..

[Steve B]

[chrisgixer]

This reminds me of the damage evident in Mick Dundees 2.6 engine a few years back. Only more severe. There was a suggestion his  car had been through flooded roads during a trip to Newent. Bad enough for the engine to "possibly" ingest water.

But why does it always seem to be the 2,4,6 head?

Post 177
http://oldsite.omegaowners.com//forum/YaBB.pl?num=1236287115/all

[05omegav6]

Are those the inlet or exhaust cam bearing caps?

As for it always being the 246 side, arguably the intake is nearer the air supply being on the righthand side of the engine Or perhaps a temperature issue... that side of the engine is relatively crowded

[chrisgixer]

What's in the back of my mind, is the fuel trims when fiddling with LPG. They don't go both lean, or both rich. 1 bank goes rich, Tother lean. I forget which though, and I've never seen them go out on petrol to see if it's normal on petrol, or something is arse backwards on LPG. ...or it's simply that plus/minus is allocated wrong (on the software  )

[chrisgixer]

So, if the maf is failing, would one bank go lean (246) and tother rich...? (As I've seen with mine on gas and the software that won't ge named)

[Marks DTM Calib]

So, if the maf is failing, would one bank go lean (246) and tother rich...? (As I've seen with mine on gas and the software that won't ge named)

Nope

[Steve B]

Are those the inlet or exhaust cam bearing caps?

As for it always being the 246 side, arguably the intake is nearer the air supply being on the righthand side of the engine Or perhaps a temperature issue... that side of the engine is relatively crowded

Both... They are all like it 

They all look like they have had sandpaper around them

[Marks DTM Calib]

Those cam caps have been fitted in the wrong place/orientation in the past I would infer by looking at the wear.

But clearly they are not contributing to the issues.

Do a valve leak down test to check where the compression loss is before doing anything.

[aaronjb]

Do a valve leak down test to check where the compression loss is before doing anything.

Bit late for that if James has already pulled the head off, no?

[Marks DTM Calib]

Er no, fit plugs, turn head over and fill combustion chambers with a suitable fluid (not water). 

[JamesV6CDX]

Do a valve leak down test to check where the compression loss is before doing anything.

Bit late for that if James has already pulled the head off, no?

No this test requires head off

Really struggling to get a head gasket for tonorrow, I have all the other parts on the side!

Annoyingly I have y26se head gaskets and x30xe composite ones but no bloody metal y32se ones!

[JamesV6CDX]

Have had the head flat, upside down, for about an hour.

Plugs in, each well full of white spirit

Number six has dropped notably. Guessing 2mm.
Number four has dropped a tiny bit. Still detectable by eye
Same for number two

Consistent with the compression test...

[Marks DTM Calib]

No its not.....that's a bit more concerning as such a small amount of loss would not result in such a big compression loss.

Which port is it running into?

Exhaust or Inlet.