Head difference

[cmcfaul]

Why is one head different from the other 5? It has different stampings, same part number but is a bit smaller.

Can anyone tell me what this is?

Should be a 73 911E Head.

The valves appear to be the same size.

Thanks,

Chris
73 911 E

[Flat6pac]

The 1819g number is the correct E heads.
The K1 is shown as 74 to 77 no air injection in the reference material I have but it gives a different casting 911 104 345 OR
Your casting number on the center head is for your matching heads as that number was used on the 70/71 T heads and the 70 to 73 E

Bruce

[cmcfaul]

It obviously works but it's strange that it's smaller then the others.

Chris