360 with a 3" dual exhaust - What to expect ?

[SuperDuty455]

Hello,

I currently have a 3" straight dual exhaust in my Cuda, and I'm going to install a stock-ish early 360.
I know it's way oversize for a 360, but how would a small block behave with such a big exhaust system ?

Thanks

 

[Xcudame]

Just about zero back pressure! Be almost like running open exhaust.

For a stockish small block (360 or smaller), 2 1/4" is more than adequate. For a big block or stroker small block, 2 1/2" is really nice. For high performance big block and stroker big blocks, 3" is good.

So you see where your at.