AVS CARTER vs THERMOQUAD?

[StockMan]

I've been putting together a Thermoquad that I'm going to try in place of the larger AVS carb on my 68 440 magnum.  The larger AVS performs well but I think I could do better mileage on highway with the thermoquad.  I have a 1973 spread bore intake, does anyone know what should be done to properly decommission the EGR ports?  There are the external ones which I'm assuming could be covered with a plate, but there are also the ports/hole visible inside.  Does anything need to be done with them?  I might be better off just picking up an aluminum intake.  Thanks

[hemi-hampton]

I think the biggest ThermoQuad they made was 1050 cfm & hard to find. LEON.

[daveco]

For the EGR, a block off plate is all that is really required. The open ports inside the manifold can be left as is.

[Nacho-RT74]

locally my car came from factory with EGR intake but not equipped, simply sealed, so don't worry about simply install a block off plate.

Edelbrock sells these intakes too, with simple the caps for it if not to be used

[odcics2]

Keep in mind that the TQ was invented as a way to help cope with rising under hood temps for emission standards. Also, to get more MPG at the bottom end, in normal driving.   Better velocity at the smaller primary nozzles = better torque and drive-ability.

They DO perform well if they aren't warped or jacked around with, as in the secondary air door flops open too fast.
That gives the illusion of rapid accel, when the fact is the car bogs a little than catches up.
Tuning one with the choice of changing jets AND metering rods is beyond a lot of guys without a dyno to actually see results.  Holleys are easier to tune. That is a big advantage for most of us.

A good running TQ is smooth from top to bottom. You should NOT feel the secondary air door open. You should just get firmly planted in your seat!   

[Dino]

I remember when I replaced my 750 Edelbrock with an old TQ. I went throgh the whole tuning process, with the help of many members here, and on my first test drive I felt like a 6 year old I was so giddy! I could not believe how hrd that sucker pulled when those secondaries opened. Cruising on the primaries was super smooth and mileage improved as well.

Unfortunately over time other issues with ignition and fuel supply made the carb drip at idle and at this point the carb's going to need a full rebuild and tune again. I'm not sure if I want to do this again or just get a Street Demon or maybe even a Proform. I'll be going to EFI as soon as I can bt will have to rely on carbs for a little while longer. I'd like it to be my last carb though.

[StockMan]

For the EGR, a block off plate is all that is really required. The open ports inside the manifold can be left as is.

Thanks