72-73 cylinder heads - what do I have?

[Jesse-911E 1969]

What do i have?

I have found a set of 6x cilinder heads, it seems to be correct for ‘72 and 73 911S with casting number 911.104.307.1R

Can anyone confirm?

[72targa]

Moved to Technical. Good luck with your search for info.

[Jesse-911E 1969]

Thanks Peter!

[Claudecot3]

There was a thread about cylinder heads either here or on the bird's forum with someone having compiled a excel sheet of cylinder heads casting number and specs.
It ain't complete and I wouldn't want to share publicly a work that isn't mine without being able to give proper credit to the person.

Your casting number isn't listed in it though.
Given the dates and the "307" I would think this might be some "S" heads. Measurement of the intake and exhaust ports if they are original would help a lot.
Just as a reference point: 911.104.307.0R casting were 1970 "S" heads, the records I have are late 69 production (for 2,2L).
Ports measurements; Intake: 36mm Exhaust: 35mm

1972 S would be 36/36 from the file, but I don't have any prints from Porsche about this (as there were up to 1971).

Good luck

[tom1394racing]

Jesse

The casting markings indicate 2.2/2.4 S heads. They should have the MFI injector holes and the stock intake port size should be 36 mm.

[Chuck Miller]

Try this thread:

https://www.early911sregistry.org/fo...onfusion/page4

[Jesse-911E 1969]

Thanks guys, these are indeed for 72-73 911S and for RS (although the casting dates a not correct for RS).

[Jesse-911E 1969]

Yes 36mm and MFI ports

[Claudecot3]

Are they 35 or 36 exhaust? For my personal knowledge

[Jesse-911E 1969]

I think 35mm exhaust, but all is quite dirty/ hard to measure exact!