S90 or SC heads?

[retro356]

How can I tell which these are? Without removing valves to mic. Any numbers? I want to sell them, but need to know what they are?

Thanks,

Stephen Retrotech: Classic and vintage Porsche cars, accessories and Porsche parts

[callard]

Super 90 heads are black anodized.
Chuck

[retro356]

so are some SC heads. They are Black

[callard]

If you can compress an intake valve spring on the car, look at a keeper. S90 are smooth inside and SC should have ridges.

[retro356]

They are for sale on E Bay.

[356RS]

Like Chuck said about the keeper area. And since you go that far, look at the valve number at the top. Should be marked #3041, which is the 40mm S-90 intake.