[Stan Weiss]

Originally Posted by Tom Vaught

Years ago, Joe Zajac and Larry Kaufman were trying to get a bit better response out of their 750 cfm AFB carbs with the 'generation 3' intake that Randy Williams did for them for the NSS cars.
The 'generation 3' intake is very similar to the Intakes being produced today.

So they tried the mod I suggested.

Two AFB 4 hole metal plates 1/8th inch thick. Carb throttle bores for the 750 cfm carbs may be different vs the carbs you choose to run.

MATCH the metal plates to your carb throttle bore sizes.

Now for the Modifications:

Measure and cut 8 pieces of steel tubing so that the inside diameter of the tubing matches your throttle bore dimensions.

Bore the AFB 4 hole metal plates so that each machined bore just matches the outside diameter of the 1" long steel tubes.

Weld "in 4 places" the metal tubes to the plates. so now you have two 4 hole "inverse" inserts that do not raise the height of the carbs more than 3/16 of an inch and still provide the "4-Hole" SIGNAL you want the bottom of the carbs to see from the intake plenum.

Worked great on Larry and Joe's intakes and they were very happy with the better throttle response, lower ETs, and slight MPH improvement.

Tom V.

Tom,
Unless I miss understand what you are saying. That sound like what many companies make and sell as "shear plates". I don't know that I have ever seen one made for an AFB.

Stan