Hi. I have an exhaust leak at the flange. Where can I get good Manifold gasket and Flange Gaskets?
Been down this road with a BB Chevy in my old dually
First thing I would do is check to see if the manifold is warped.
If the manifold is relatively flat you can use a standard composition style exhaust gasket, Mr.G Ultra Seal, etc.
If it's 1/16" or a bit more there are some embossed copper gaskets on the market. Summit has their own brand at a reasonable price. That's what I used and they worked well for me.
https://www.summitracing.com/oh/parts/sum-111425/overview/The Remflex gaskets are awfully thick and may cause mounting issues.
BTW...... Happy Birthday!!