UPDATE: Edelbrock 1406 Tuning

So far, upgrading the metering rods from 0.75" x .047" to 0.70" x .047" and the step-up springs from 4" to 5" Hg has made a huge improvement to how the car drives, especially the flat-spots it was suffering from during acceleration from a dead stop as well as at highway speeds between 60 and 70 mph.

As detailed in a previous post, changing the metering rods and step-up springs is a piece of cake, and after doing so, I tuned-up the carb once more and have it idling nicely at 600 rpm at operating temperature (1200 rpm on a cold start).

It does run a little richer with the current set up, but that's okay as long as it's running fine. As a matter of fact, I had it out yesterday for a car cruise-in and it ran beautifully. And on the highway, it now blows past the previous 60-70 mph flat spot, easily.

I still plan to install .100" primary main jets, up from the original .098" jets. Secondaries will remain the same at .095".

So stay "tuned" for another update soon.

And thank you for following my '76 Vette Blog!



Product Links... (#sponsored)

• Edelbrock 1406 Performer 600 CFM Square-Bore, 4-Barrel Carburetor
• Edelbrock 7501 Performer RPM Air-Gap Intake Manifold
• Edelbrock 7201 Intake Manifold Gasket - Pair
• Edelbrock Elite II valve covers
• Edelbrock 7549 Valve Cover Gasket Set
• Edelbrock 1203 Pro-Flo Series Air Cleaner | 10" Round
• Edelbrock 10023 Pro-Flo Series Air Cleaner | Triangular 11" x 8" x 3"