[PxTx]

I think this is a pretty common experience with many people. Not described too scientifically so I'm gonna assume you don't have much data on the differences between the ways the carbs were set-up.

Motion commonly modified them with mechanical secondries, which then required the trick secondary squiter mod to help with the big secondary venturi opening.

Were both still vacuum secondaries? How about the accelerator pump configs like cam, squirter size etc?

The metering plate you referenced, did you mean a metering block, or did you install a modified/different metering plate?

I agree, they may be difficult to tune but there are better resources available these days. Joel made them run by puting them on a dyno and using an exhaust gas analyser to tune each circuit. Now you can use a wide band O2 and drive it on the road and log data.

I am confident that they can still be tuned to make respectable HP and decent drivability. Maybe not quite as good as a modern carb, but certainly within a few percentage points.


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I had spent a lot of money on my 950 CFM unit, even adding a secondary metering plate to it, and was using it in conjunction with an old Edelbrock C427X dual plane intake on top of my L-88. I thought I actually had it dialed in and running good for a while there. Then one day I pulled it off for some reason I don't even remember and just threw on a box-stock 850 Holley DP and I gotta tell 'ya.....it felt like I had installed a Nitrous system because the car felt so much faster. Needless to say the 850 DP stayed on permanently and the 950 3BBL went into a box in the basement where it remains to this day.

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