Carb Adapter

[bucket]

So the AVS2 or 9895 would be a direct swap onto both the alloy oem spreadbore intake on my 70s 350 -AND- the high rise oem iron intake for my 85’s 4.3L V6? Asking because the Qjet I have needs to be rebuild and will not come apart. Could only get the lower plate off for a gasket replacement. Top 2/3 are stuck solid.

No, just an aftermarket intake with an open or split/open plenum design that is meant for use with a spread bore and square bore carburetor. Otherwise an adapter would be needed.

While that AVS2 has different sized bores, it essentially is still a square bore carburetor.

 

[Scruffy49]

No, just an aftermarket intake with an open or split/open plenum design that is meant for use with a spread bore and square bore carburetor. Otherwise an adapter would be needed.

While that AVS2 has different sized bores, it essentially is still a square bore carburetor.

So rebuild the core I have or get an adaptor plate for a modern carb, or order a Chinesium repop… Got it.

 

[Scruffy49]

I’d honestly rather run a 500cfm Holley 2bbl on the 4.3 anyway.

 

[bucket]

I’d honestly rather run a 500cfm Holley 2bbl on the 4.3 anyway.

I'd be inclined to do the same. You'll still need an adapter, but it's a combo that should work well.

 

[TDoc]

I have a spare edelbrock 2701 square bore dual plane intake . Would it be worth it to install this instead of my stock Quadrajet cast intake?

I would need to use an adapter like this, correct? It’s supposed to be reversible. https://a.co/d/8RabIbE

Engine is a high output 305 LE9. Stock quadrajet, stock, manifolds, dual exhaust. I would lose the air pump and EGR if I went to the 2701 intake. No emissions where I live.

 

[Ricko1966]

I have a spare edelbrock 2701 square bore dual plane intake . Would it be worth it to install this instead of my stock Quadrajet cast intake?

I would need to use an adapter like this, correct? It’s supposed to be reversible. https://a.co/d/8RabIbE

Engine is a high output 305 LE9. Stock quadrajet, stock, manifolds, dual exhaust. I would lose the air pump and EGR if I went to the 2701 intake. No emissions where I live.

Leave your stock manifold and egr. EGR is not a bad thing,research it,thoroughly. It goes away when you are in the throttle,so no performance gain.Combustion chambers run hotter without EGR,Pumping losses increase when you remove EGR,you'll probably have to lose a couple of points of timing,possibly have preignition problems,mpg loss, and all for very little performance gain with the manifold at higher RPMs.