Quote:
Originally Posted by Baz
Interesting technical details, Shaun - thanks for sharing! 
My '73 Italian delivery 911T......this must be the plastic version Porsche switched to....
You can see the fastener layout in this pic of the ductail it had when I bought it.
Fortunately the seller still had the original engine lid, which I put back on.
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Baz, 72 and 73 are all aluminum, all black anodized. For 70 and 71 bright grilles, Porsche used zinc plated steel mounting bolts captive between the bars. But you can't run steel in an anodizing tank (unless it's been masked) so Porsche assembled the entire grille with aluminum captive bolts. These grilles are the most difficult to get right and if even the smallest flaw occurs, you have to strip it and pray you can create a proper surface condition for the right tone of black. Black anodized grilles are soul crushing. I need to do one for a very special '72 ST rallye car and am dreading it. 74 was the first year of the plastic grille.