Pontiacgp, you have got me confused. The power valve in a Holley has nothing to do with crossing two plug wires, and making the engine pop back through the carb. We are talking about "blowing some crap" out of the idle circuit, and any other junk by the squirters or throttle plates. The power valve is operated by vacuum, and you can get them in different ratings. As you increase throttle quickly, the vac drops, and when it gets to the inches of vac that the valve is set for, it opens, allowing more fuel to be disbursed. Hope I explained that OK. ...........mickey-d :lol:
