Stock exhaust size?

[Stewart G Griffin]

Does anyone know what the stock exhaust pipe size is for a small block equipped truck?  Both O.D. and I.D?

i'm specifically interested in the downpipes from exhaust manifolds to the y-point/cat converter, but if you could tell me the size for the whole exhaust system that would be super helpful.

[Captkaos]

2" or 2.25"

[jg1977c20]

2.5" single exhaust to 2.5"in muffler with a 2.25 " tail works nice on a stock 350

if going dual 2.25" is biggest you want to go - both these set ups are good to 300 hp