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Stuart, I'd like to know more about those Demons. I see no vacuum diaphragms. Can you tell me about how they work?

Just post some pics of the trailer. We can drool.

I do to, very much so. It seems people took my original comment as negative. All I meant was the OP's first post was very open ended about his intentions. I was simply curious. I guess some people have nothing better to do than assume the worst. That's not how I meant it. To the OP. Good luck...

You're from Alabama and you're callin people dense?

Naw but I wouldn't mind havin my 73 Charger back I had in high school.

So you found it. Did you buy it back or just find it? What's the point here?

Wait.....I thought the whole purpose of the six pack was to pour gas in the motor. What's the problem? lol

This ^^^^^^^^^ While you can set preliminary float levels with the electric pump, you still need to make the final adjustments running.

Yup cause I diddlydanggarrantee you them big *** diaphragms have a completely different rate, just like Meepomous says. More diaphragm surface area. Only stands to reason. What "I" always do is tune from the heaviest spring DOWN. Because nine times outta ten, you're gonna end up on the heavy...

That chart is right on the money. BUT, it can be misleading to some folks because they think they need the secondaries open all they way. In most cases, that ain't true. You want to choose a spring that allows the latest opening possible. In other words, right before the primaries run outta...

That makes sense. I am SURE at one time there was some form of spring chart either from Holley, Mopar Performance, or both. Although I've never seen one. Yup, which is why I always tell people, START with the brown or black sprAng first. The lighter the sprAng, the earlier (lower RPM) the...

If the engine is close to stock, you don't want light springs in it. The engine aint gonna move 1200 CFM at 2500 RPM. MOst people think secondaries don't open with the brown or black spring. They are wrong.

I don't have much experience with six packs, however, I have a LOT of carburetor experience. With a vacuum secondary, usually what you want is the smoothest possible transaction when the secondaries open. The best possible scenario is not being able to feel them at all. If you can actually feel...

Aint no hatin here RC. I'm just glad somebody's doin it that wants to save um and can afford to do it. Good for you buddy.

lol That was funny.

No, you're correct. There are two holes there, on the beveled area, one on each side. I had just never heard of enlarging them. It would simply richen up the shot the power valve gives when it opens.

I did some research on it and I *think* he means enlarging the power valve ports. If he's talkin about drillin new openings (which to me is what it sounded like) I have no clue.

Well I wasn't knockin you drillin the meterin blocks, I've just never heard of it. What purpose does it serve?

That's a hideously small amount of vacuum....even for that cam. Here is the correct procedure for choosing a power valve, straight from Holley. http://www.holley.com/data/TechService/Technical/power_valves.pdf Notice it says to divide the vacuum reading in half, and choose the closest power...