600 CFM vs 750 CFM...

rumblefish360 said
I don't know about "cranking up" though. (You mean starting the engine right?) I don't see a difference there myself.

Yes, I meant during cranking. I say this all with a footnote that I have no scientific evidence. But it is based on the principle that the air is moving faster through the primary side of the carburetor on the 600, and is even more critical at slow cranking rpm. And therefore would again be delivering better atomized fuel. I can say for a fact the 600 carb cranks up easier on my car. But it could be that it started out in a much better state of tune than the 750 did.

I think we're seeing things eye to eye. I'm curious about your 5.9. Have you had it on the strip? And if so, what E.T.'s did you run? The previous owner claims he ran under 14 seconds on this car years ago. I think he is simply mistaken. I think he ran under 15 seconds.

I say that because the best I could get it the only time I ran it was 15.44. And it was carbureting poorly and exhausting even worse. As good as it is now, I have my doubts it would hit 14.5. It's going to take a LSD at minimum from where I am right now, to hit 13.999999999 seconds. Based on that, there's no way he ran less than 14 seconds. And I saw notes from the glove box he made where he says, "spun" (due to the open diff) "bogged," (due to too rich) etc. So I know it didn't run well back then either.

7milesout