850 cfm proform carb on 318!!!!

darndart said

I agree with you 100%. A few years ago I did a similar test on my 73 Dart Sport bracket car. I normally run a 750 ProForm double pumper carb. One night at the track a buddy offered me his 950 ProForm to try out. I pretty much told him, he's crazy that's way too big. But for kicks we tired it anyway. The very first pass I knocked off a tenth from my best ever run with the 750(it's been on my car 7 years, plenty of tuning) with a couple jet changes I shaved a tenth and a half total! The crazy thing is, it was all in my 60 ft & mid track, mph was the same!!:wink:

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Thats a very simple analogy, The 950 carb is "smaller" then the 850, if you don't beleive it, look it up (ventury size), thats why the 950 worked well, it has 1.3/8" venturies too a 1.3/4" base, they give a much better low-end signal resulting in better 60ft. times.

The 850 has 1.9/16" venturies too a 1.3/4" base, BIG difference.

The 950 is basically just a 750 installed on an 850 1.3/4" base, of coarse it tapers out to match, so your getting a better cone / \ effect picking the air speed up as it enters the ventury, this really isn't anything new, guys modified there holley 750s back in the day to mate to the 1.3/4" base, the 750 has a 1.11/16" base.