67mustang302

The Demons don't flow more than they're advertised. No wet flow carb on earth does(at the same depression anyway). If it's converted to a "dry" flow number(no fuel spraying from the boosters) then the cfm rating goes up, but the engine never sees dry carburetor flow. The fuel cone coming out of the booster is a restriction to air flow, so the wet flow ratings are designed to show what the carb cfm flow is in real world operation with the carb spraying fuel on a running engine.

People think they're under rated because they're comparing them to bogus flow ratings from back in the day. They're not under rated, they're ACCURATELY rated.

kalli

*g* == grin
*fg* == fat grin

as for the carb choices. When I had my 289 I was always on the look for a good autolite4100. If at the time I finally bought a carb they'd have that hollit for 250$ I would have snatched one off the shelf straight away. I think thats a lot of carb for that money

Kalli

Joe67

OK, i have a few sides job coming form work, I have my sights set on the Sumolley, or If i can accumulate enough from these jobs a new 570. I'm pretty excited considering it'll be a good long while before i can even run the motor.

htwheelz67

take a 750 holley an 750 demon and wet flow both, the holley will flow less.

67mustang302

Really? Considering they're both rated at a wet flow rating? Unless Demon uses less than 1.5" hg when they do their flow testing.

Like I said, not under rated, just accurately rated.

htwheelz67

I'm pretty sure holley and edel still flow dry, my prosystems 950hp is wet flowed and it flows 867 cfm, if you look at demon vs holley venturi vs throttle blade size you will see a lot of difference in cfm vs cfm rating. I see what you are saying but I'm saying a 750 demon is more like an 850 holley.

67mustang302

It probably depends on the Holley as well. I bet the HP and Dominator series are a lot closer to their rating than some of their other more basic carbs.