Euro spec intake port

[garrett490]

What's the 911 SC euro intake port spec? 39mm? Is this the only port on the heads that larger than US version or are exhaust and valves bigger also?

[Flat6pac]

All valves are same size, 3.0, 3.2,and3.3
76/77 3.0, 78/79 US andROW and 80 to 83euro are all large port heads
Bruce

[garrett490]

Large port heads...what's the measurement? Does that mean both the intake and exhaust ports or just the intake?

[cgarr]

The exhaust are both the same at 35mm the intakes are 39mm early and 34mm late SC