Intake Manifold, Applicability and Color 914-6 Options

[DennisV]

On the 914-6 a couple intake manifold questions:

1. Would the same manifold be used for Weber IDTP and Zenith 40-TIN? They ones I took off our car had Zenith 40-TIN on them. I'm wondering if I can use the same for correct Webers. One version of the listed part numbers seems to match 1970 911 where Zenith were used. That seems promising.

2. Were they originally black? I've seen some restoration videos where people powder coat them black. Including the inside. Ours appear black. That said, I think they are magnesium. Why would Porsche paint these?

Thank you.

Photo as found on engine.

[Superhawk996]

For what it’s worth I’ve seen the coating on the inside.

I’ve also heard it was done to keep the side of the runners smooth improving airflow and keeping fuel from coming out of suspension when moving along the walls and better atomized.

I have a pair of manifolds I stated to refurbish. I can say that that coating is tough, very hard. Doesn’t come off easily with Glass bead. I eventually stepped up to Aluminum Oxide, even then, it took me at more time and effort than it should for something like paint.

I read but can’t point to link on the bird that it was some sort of early baked on teflon type coating. Honestly I don’t know what it was but it sure doesn’t come off easily!!! Whatever Porsche had put on there - they spent money on it and I can’t imagine that being done without reason.