I installed the AEM wideband air/fuel mixture gauge in my GP a few weeks back. That is the best carb tool I have ever purchased. I have been playing with carbs many years and always got them to run real nice, or at least I thought they were running real nice.
There is no more gauging the carb by the ear and the foot for me. You make sure your float is at the right height then set the idle to 14.7 by adjusting the mixture screws. That number with change with the idle speed so you have to adjust the idle speed and mixture till you get both right. Then you can see what the carb is doing while you're driving. I could only get around 13.4 while cruising so I changed the primary metering rods to #48 from #43 and left the #75 jets in place. I am now running 14.8 while cruising at 2000 rpm. I should get 2-3 mph better on the highway. The car moves along better with what seems to be a small adjustment with the air/fuel ratio and it sure is nice to know what the carb is doing.
As for Holley carbs which are easier to work with I really like the Quadrajet with the metering rod and the jet which means you can fine tune the Quadrajet in a way you can't with a Holley. The Holley is easier to set the float level than on the Quadrajet but as long as you use the trick that Edonthebeach told us, apply a light coat of lithium grease to the gasket that Edonthebeach you can resuse the gaskets many times over. I have had the top plate off 3 times and the gasket is still like new. Another method of coating the gasket is with chap stick, Jack told us about that one but I have never tried it.
There is no more gauging the carb by the ear and the foot for me. You make sure your float is at the right height then set the idle to 14.7 by adjusting the mixture screws. That number with change with the idle speed so you have to adjust the idle speed and mixture till you get both right. Then you can see what the carb is doing while you're driving. I could only get around 13.4 while cruising so I changed the primary metering rods to #48 from #43 and left the #75 jets in place. I am now running 14.8 while cruising at 2000 rpm. I should get 2-3 mph better on the highway. The car moves along better with what seems to be a small adjustment with the air/fuel ratio and it sure is nice to know what the carb is doing.
As for Holley carbs which are easier to work with I really like the Quadrajet with the metering rod and the jet which means you can fine tune the Quadrajet in a way you can't with a Holley. The Holley is easier to set the float level than on the Quadrajet but as long as you use the trick that Edonthebeach told us, apply a light coat of lithium grease to the gasket that Edonthebeach you can resuse the gaskets many times over. I have had the top plate off 3 times and the gasket is still like new. Another method of coating the gasket is with chap stick, Jack told us about that one but I have never tried it.
