These two setups I built with prgressive as per the owner..I had to redo the linkage to run all four at the same time.. Duane.
The Weiand manifold was designed to be a race, not a street, mainifold. The article I wrote gave you a way to adapt it to street use. Power valves weren't a concern because the Stromberg 97 power valve doesn't even open up unless the accelerator pump goes all the way to the bottom of the pump well and hits the power valve plunger. The article was discussing how to make the manifold behave well on the street, not on the dragstrip. Since running with straight linkage is the only way to get decent fuel distribution, a systematic approach to determining the lean to rich threshold was discussed. Once that point was reached, only two accelerator pumps were needed as running all four tends to make the engine run too rich (they discharge fuel whenever the throttle is advanced, even slightly) Remember, we're taking an all out race manifold and tweaking the carbs to make the thing streetable so that it won't foul plugs all the time and have decent operating characteristics. Because there are only two of the four accelerator pumps connected, only two of the power valves will ever have a chance of opening and that'll happen at near WOT. If you're concerned with a need for dumping more fuel in at WOT, go with a lower numbred power valve, otherwise, leave them alone. They'll stay closed until you plant your foot in the carbs. One thing you need to remember and that's that the old (sitting around for years) 97 power valves usually have weak, rusty springs and, as such, have a tendency to leak in high vacuum situations (cruising, decelerating). If you're unsure of the state of your power valves, pick up a set of new ones from someone like Mac's Antique Autos or any other dealer selling the "new" 97 carbs.
That left pic looks like a Cragar manifold but it appears to have a different logo on top. What kind is it?
The Jalopy Journal
