[dscott]

DV, I bet I can kick my Holley farther than yours! I don't use the Holleys much anymore. We use them on most of the race engines we build just because racers want the changability and of course you can get great big Holleys. Many of the Carbs we build for the racers run on Methanol or Ethanol so major mods are necessary which the Holley will accomodate. For the street I use the Edelbrock carbs. The 600 on engines up to 350hp, 700 on engines up to 425hp, the 800 up to 475hp. Over that we usually go to the Holley dp. We have dyno tested both carbs on probably 25 different engines and found the same results in all cases. They produce the same hp. I like the Edelbrock because it is very reliable and forgiving. We have had to change metering rods and jets for the higher elevations, which is very easy to do, besides that they run about the same in any weather or humidity. I've probable sold about 150 of the Edelbrocks over the last few years and haven't had a single call on any of them. I have had nothing but problems with the Holleys for along time. Constant jet changes, blown power valves, leaking bowls, sticky needle and seat. I always carried a small hammer in the car for the needle and seat problem. You do lose the "Holley look" on your engine but for reliabilty I'm sticking with the Edelbrock.

JLW, Your theory is correct on the 650 and 750 Holley carbs. The 650 will draw more fuel.
Don