I tinkered out in the shop today with the acc. pump linkage for a holley 1945 (piece with U in it) and I fashioned one that could be easily unhooked and slid into a different pump actuating slot. My question is, will this give me a better/quicker pump shot by moving the linkage to the shortest slot? I really don't care about mileage, I just want a fatter pump shot to cover the lean spot before the power circuit kicks in.

Will I have to do all the measuring and adjusting when I'm done too?

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82 D150-225/727
02 Dakota-3.9/5 speed
87 GMC C7000-8.2 Detroit Diesel/5+2

I tried all the different slots on mine and didn't notice an appreciable difference. Of course I also discovered some p-valve issues once I actualy tore into it, so my experience may be moot.

If you pull the accelerator pump there is an adjustment on the shaft made by a clip that corresponds with the linkage slot you use. I can't remember which goes with which.

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aed
/6>V8

So the shortest slot is the "quickest" one?

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82 D150-225/727
02 Dakota-3.9/5 speed
87 GMC C7000-8.2 Detroit Diesel/5+2

Jeb, I didn't play with mine so I couldn't say. I just set it where the old one was when I re-built it.
It seems to me that the set-up with the longest stroke for the pump would produce more jump.

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aed
/6>V8

Which would be the inside (shortest hole).

It's basically a rocker arm. With the linkage to the throttle, the hole (wherever it is) moves a constant vertical amount. When you're on the inside hole, the arm moves thru a greater angle for a given amount of 'hole' travel. Thus the other end of the arm moves farther when you're on the inside hole.

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes