Cylinderhead number

**K Simmonds** · 9 January 2014, 20:50

It's the engine number

.

**V6quattro** · 9 January 2014, 20:57

I don't have a number on my cilinder head. Anybody know what that means??

**quattrito** · 9 January 2014, 20:57

Mine 7A doesn't have nothing stamped on it.

**UrS4boy** · 9 January 2014, 21:05

Originally posted by V6quattro

I don't have a number on my cilinder head. Anybody know what that means??

Any ABY or AAN or ADU head with no number means that it is a replacement head.

**UrS4boy** · 9 January 2014, 21:10

Originally posted by hermanio

I was wondering, what does the number on the cylinderhead mean.

The number after the engine code, so ADU ******

As per this post, the engine number. No number = replacement head

quattroworld.com Forums: 20VT Engine Numbers: Location and AAN, ABY and ADU Engine Build Dates

http://forums.quattroworld.com/s4s6/msgs/123036.phtml

The Audi Enthusiast website. Forums for all Audis including A4, S4, A5, S5, A6, S6, allroad, A8, S8, TT, R8, Q5, Q7, 4000, 100, 200, v6, v8, vintage, local forums

Here are the ADU engine build date ranges:

**V6quattro** · 9 January 2014, 21:17

Originally posted by UrS4boy

Any ABY or AAN or ADU head with no number means that it is a replacement head.

I have a converted 7A head on my car. Is a 7A head without a number also a replacement head? It only has '1996' stamped with small numbers in the middle of the right side of the head.

**spink** · 10 January 2014, 00:03

Originally posted by V6quattro

I have a converted 7A head on my car. Is a 7A head without a number also a replacement head? It only has '1996' stamped with small numbers in the middle of the right side of the head.

No 7a head I have ever seen(a lot) has had an engine number on it

Cylinderhead number

Cylinderhead number

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