I'm just about finished building my 261 to stick into my '51 1/2 ton and therefore am ready to take it to the exhaust shop. I'll be running Fenton's, an X-Pipe and duals.

I've read a variety of differnt suggestions on pipe diameter and muffler choice, so I'd love some input that everyone can refer to later.

Diameter: from header to x-pipe to muffler and muffler to tip? I've heard a variety of things. Someone told me to keep it 1 5/8" between the header/x-pipe/muffler and run 2" after that in order to build up enough back pressure and efficiently scavange with the x-pipe which should be located within a foot or two of the header outlets. Lots of people seem to like the flow masters, but which one? 40, 60, 70?

I'm torn between going 2" from the fenton's all the way back and doing the narrower pipe in the front.

Any thoughts?

'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi