70 RR 440 carb advice

[roadrunner57]

70 440 RR with automatic trans and AC.

So I have an AVS 4640 SA, rebuilt about 10 years ago and never ran.

I also have a thermoquad 2146 just sitting on the shelf.

Since both will be a rebuild, which is most suitable for a 440?

 

[turbine68rt]

The 4640 is for a/c application. I'd go with that. Just an opinion.

 

[WP29440SE]

I always run an AVS or AFB over the thermobog, mainly for reliability, maintenance and tuning . they are the easiest carbs on the planet to work with.
in my opinion of course

 

[33 IMP]

Depends on whether you have a spreadbore intake manifold or not. I think a 70 still had a holley/afb pattern intake, so the
Thermoquad wont fit without an adapter.

 

[Jax_1975_Dart]

I’m also team AVS on this one. Great carbs for 440 applications.

 

[RJRENTON]

Carter AVS carbs are an excellent, IMO. ...easy to tune and service. Although they were of the emission control era, they can be "adjusted" to subtlety eliminate their short comings. There are many service components available on the internet as well as specialized rebuilders as well as thru FBBO site WOODRUFF CARBURETOR SPECIALITIES.
BOB RENTON

 

[Bee1971]

4640 is a 750cfm Carb - 440 HP

Nothing wrong with that carb especially if it’s in good shape and you want to install the flat metering rod covers , and then convert to the Edelbrock metering rods/jets

That way you can test and tune the easy way

Watch for the hot idle compensator and vacuum , I like to block them off with my own gasket

Also float level and drop is critical

And the accelerator pump leather drying out

I can’t remember what Edelbrock accelerator pump I ended up using / WAS NOT the Blue one

Flat Metering Rod Covers

Edelbrock

.101 Primary Jets - .065X.052 Metering Rods

.107 Secondary Jets makes for a good start