Cascade Crew

'92 camaro boss · Posted: Fri Dec 26, 2008 10:33 pm Post subject: Carb question

ok, so my uncle just gave me a carb off his 79 pick up.. it is a 454.. i'm wondering if it will fit on my el camino's 400..

rjmcgee · The Hammer Joined: 08 Jan 2004 Posts: 2328

What kind of carb?

What kind of carb is currently on the El Camino?

chevymad · Posted: Fri Dec 26, 2008 11:18 pm Post subject:

If its a quadrajet it will work. It won't be exactly right but it should work pretty decent. If its a holley or afb style carb, then you may need to rejet it. And more to what rod's thinking, you may have things to change to make them fit if changing from one to the other. All 3 fit differently.

'92 camaro boss · Posted: Fri Dec 26, 2008 11:33 pm Post subject:

forgot to put that on there, it's a rochester, no clue what cfm it is.. i just know it's a working carb and right now the el camino has the stock 2 barrel on it.. but it's got a new 4 barrel intake..

so there's a possibility that it's not just going to be a simple swap?..

chevymad · Posted: Fri Dec 26, 2008 11:47 pm Post subject:

A quadrajet will come closest to the right tune, it also won't matter what size it is, since they are variable on the secondaries. Going from 2 to 4 barrel you'll probably need the proper throttle brackets, and maybe even a different throttle cable. You'll also have to change your fuel lines, vacuum lines etc. I consider it a simple swap, just not a direct bolt on.

It will be on the rich side, but since you're a 400 thats closer then bolting it on a 350 or worse a 305.

If its the proper 454 carb it should be a 750cfm. Certain olds and caddillacs got 850cfm quads. But not the chevies.