Recent content by Blue_Ridin_Hood

Thanks Todd for those pages! That's plausibel. I'll need some minutes to go through it but I'm really happy. I have owned the car since 2016, but I managed it mostly with the manual for the 1971 chassis from teambuick.com, so I've never had a description of the EGR or the AIR system. Thanks a...

Hi Bob, thanks for your link. But that's only the cast of the 1970' intake from the internet I posted for comparison. The number of my 1973' intake is 1243020 and it's unfortunately not linked with an image on the reference page.

Interestingly, I just got a photo of an 1973 Pontiac 455 manifold from an ebay seller whereupon you can see some bores under the primaries, too. My next step would be testing the bores with pressed air and see what happens. I guess for borescoping the holes are too small. And alternatively...

Thanks for your answers by now. Larry is right, when I wrote 'AGR' I totally meant the EGR (in German exhaust means "Auspuff", so there comes the A from) So back to my intake manifold: I attached three pictures of my one. In the first you see the cut off A.I.R system with the blue circle...

Hi everyone, I own a 1973 Buick Centurion 455 and I wonder what are those plugs resp. holes inside the intake manifold just underneath the carburetor for? I've attached a photo from the internet of a 1971 manifold, cause in my intake manifold aren't those plugs. It seems like there were holes...