Just wanted to pass along a little experience. While working on the NOS installation on my 90 Bonneville I wanted to remove the TB, clean it, and drill and tap the casting for the fogger nozzle. The only hitch, nobody has the gasket that goes between the TB and the intake manifold.
So, I went back to the old school stuff and made my own. Here'* the skinny for anybody who finds themself in a bind. The only two materials needed are a roll of gasket material (most auto parts store, couple of bucks) and a tube of machinist'* blue (also available at auto parts stores.)
There'* two approaches to making a gasket like this, first is to layout all of the dimensions on a piece of material using pencil, ruler, and compass. That'* what I did for this gasket as I did not want to remove the TB till I knew I could put it back on the same day.
Second approach is to rough cut an oversize piece of material, locate and cutout the bolt holes. Then, paint the TB flange with machinist blue, install the unfinished gasket, put the TB back on and tighten the bolts. The machinists blue is really a kind of ink that acts like liquid carbon paper, transfering the impression of the flange to the gasket material. Then, just cut out the gasket with a Xacto knife.
When you are done, take some 220 grit sandpaper and sand all the cuts on the gasket, giving it a smooth, beveled edge. Now it'* ready to install like a factory gasket. BTW, while you have it ready to go, trace it onto another piece of gasket material so you have a ready made copy, just in case you need another one. Roll of material was $6.00 and is enough to do about 15 gaskets of this size. Price for one FelPro TB Gasket- $10.99 and it was a special order. (Guess who'* gaskets I'll be using from now on