carb manifold please help

[81impala267]

hello i got a 1981 impala with a 267 v8 with a rochester 2bl carb i bought a rochester 4bl and i was wondering what size manifold do i buy or can i buy a adapter that goes from rochester 2bl to rochester 4bl if so where do i buy and what is it called thank you. please help.

[techinspector1]

Install a Rochester 4-bbl intake from any small block Chevy and bolt your carb on. I doubt that you'll see any significant improvement, though, because the manifold intake runners will probably be bigger than the head ports and will likely cause turbulence at the manifold/port interface.

Don't even think of trying to use an adapter between the 4-bbl carb and the 2-bbl manifold. All the geeks down at the drive-in will laugh at you.

[viking]

.............Don't even think of trying to use an adapter between the 4-bbl carb and the 2-bbl manifold. All the geeks down at the drive-in will laugh at you.

We use to call that a " funnel ram "

[thesals]

yup, its only good to go the other way 4bbl mani 2bbl carb, and thats for special racing applications.... but yeah, those 2bbl heads are just going to cause you problems with a 4bbl setup..... if you want to do it, i reccomend buying a decent set of heads that are ported big enough for a 4bbl.... check out ebay.... sbc parts are a dime a dozen there