gas mileage Mechanical vs Vacuum Secondaries

ramcharger said

That's a plug in there and it can be removed and replaced with a power valve, they don't come without a provision to add one like my holley 4777.

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OK. Sure. For clarification, I never said it didn't come with a provision for a power valve. I said it didn't come with a secondary power valve.

BUT, if you're going to use the thing for racing, you don't want a power valve in the secondary for the same reason you run jet extensions. You don't want the fuel running away from the opening on launch.

Also, its easier to control secondary enrichment when its all done through the jets of course.