whats this 16v head and inlet manifold off

[superhans 0]

The part number on my head (9a block) is 051 103 373 according to ETKA it should be 051 103 351. I bought another head cheap whos part number is 027 103 373 which came with inlet manifold with part number 027 133 223(upper section). My question is what block is the new (cheap)head and manifold off, and will it be ok with my engine. Also why does ETKA not recognise both of these heads part numbers they are almost the same apart from the 373 on the end what does this mean. it also has no record of the inlet manifold part number. Whats going on. Sorry for all the numbers any help would be greatly appreciated.

[Dennis.be 0]

Audi had the same engines, 6A was for Audi te enginetype and also an 2.0 16v.

[superhans 0]

They part numbers don't match the Audi head either.

[flusted 0]

The part nos indicate port sizes! the o51 has small inlet ports to improve low down.I have a flowed o51 on mine