Early 911 Cylinder Head Cross Reference

[tom1394racing]

Based on a question from one of my customers, I did a little research and put together this early 911 cylinder head cross reference listing.

I thought others might find it useful.

Note there are a couple of missing pieces. If anyone knows the casting numbers for those heads, please let me know and I'll complete the list.

[Tippy]

Nice.

Flow ratings (CFM) would be over the top!

[Steve@Rennsport]

Nicely done, Tom.

[WERK I]

Tom,
Nice and thanks. You don't happen to have the combustion chamber volume for those heads listed, do you?

[Hcarraro]

Good information Tom. Thanks for sharing.

Henry

[777joee]

Saved, Thank you.......

[Flat6pac]

The 2.7 Carrera mechanical uses the same as the S of 70 to 73. I had one in my hand this week with a 75 date stamp on it.
But I will save the sheet for the information,
Bruce

[304065]

Originally Posted by WERK-I

Tom,
Nice and thanks. You don't happen to have the combustion chamber volume for those heads listed, do you?

The 2,0 liter heads are 72cc, the 2,2-2,7 are 68cc.

That's all I know, the earth ends for me in 1978 . . .

[tom1394racing]

Well let's see....The SC heads are 90 cc so that almost completes the list.

[WERK I]

Originally Posted by 304065

The 2,0 liter heads are 72cc, the 2,2-2,7 are 68cc.

That's all I know, the earth ends for me in 1978 . . .

Originally Posted by tom1394racing

Well let's see....The SC heads are 90 cc so that almost completes the list.

You guys are the best! Happy New Year!

The 3.0 SC, 3.2 Carrera and 3.0/3.3 turbo heads were all 90cc, correct?

[Tippy]

Tom,

Is the intake port diameter for the 930 heads correct?

Why I ask, is they are smaller than almost all the N/A motors.

Just curious. Great data collection!

[Flat6pac]

They have always been smaller as to keep the volume speed with direction.
Bruce

[356RS]

Thanks Tom and Happy New Year.

[tom1394racing]

Updated with additional data

[totle]

Does anyone know why Porsche used so tiny porting for the 3.3 Turbo? (32/34)

Was this due to emission?

[Flieger]

Smaller ports increase intake air velocity at low engine speeds, sharpening throttle response at times when the turbocharger is not operating at its optimal efficiency and boosting.

[MBEngineering]

HI Tom
some photos of the Carrera 3 head for your chart;






casting part No' is 930 104 329 2R










regards mike

[tom1394racing]

Hey Mike

Thanks for the info.

Here's an updated listing with Mike's new data.

[MBEngineering]

HI Tom
you will need to make a note on the carrera 3.0Lt head, that it has NO air injection as the part No's(sorry the casting No's) are the same for the SC head that has air injection.

regards mike

[Flat6pac]

I was sorting heads last week and have a couple K2 to add to the list
Bruce