7D2

Which quadrajet base gasket do I use for a 72 sb? The four hole or hourglass shape? 1/16 in. or 1/4 in. Thanks in advance.

Sweet70

I have a 70, the four hole gasket pre dates mine. There was an earlier option using the four hole gasket that also required an aluminum gasket to allow exhaust gasses to heat the carb. I would suspect yours requires the hour glass gasket. A thicker or insulating gasket will help in keeping your carb/gas cooler, especially when you switch off the engine.

lars

Run the 1/4" open plenum gasket.

Lars

7D2

Thanks for the help.

Jeff_Keryk

Make sure you don't have the smiley face manifold.
Just sayin'...

lars

That's a good point, but a stock '72 intake won't be a smiley-face. Which is not to say that somebody may not have installed a '69 manifold... always good to make sure.

Lars