Summit Racing does not know what they are doing. They recommended the wrong power valve - a single stage - that would have damaged my engine.

I called Holley and sent them photos. The only way to get the power valve for a E6JL-9510-AB carb, (which is a Holley number LIST 50278-1 1826) is with the complete Holley 3-1346 rebuild kit.

Also, the backfire preventer kit will work with this. The instructions are vague. The check valve is installed in the carb base in the smaller hole that lines up with the little brass insert in the upper body that leads to the niche that the power valve lives in.

 

The single stage power valve is not going to 'damage' your engine.

It's certainly not optimal for your application, but as I said you can easily get the correct & complete Renew Kit.

Glad to hear you've installed the anti-blowout valve without much trouble.

 

The Holley expert said that the 2.5" vacuum single stage valve would never open on a system that idles at 18" vacuum. He said it would cause the engine to run lean and would damage it. Just sayin' ....

 

I have never heard of anyone running a 2.5 power valve. Get a 6.5 and it will work just fine.

Interesting claim by this "Holley expert" but even my stock 428CJ pulled less than 2" of vacuum at WOT.

 

Holley recommends 1/2 of idle vacuum. -shrug-
I surmise that is for performance where the engine is either WFO or closed throttle.

My truck pulls over 23", should I be using one that opens at 12???
This is the reason for 2 stage valves.




https://www.ford-trucks.com/forums/1...l#post10493176
Post #31, 6/23/11