I have a 69 RR 383 .30 over purple cam stock exhaust manifolds 906 heads. It has a worn out 1406 Edlebrock I believe too small not great throttle response and poor performance. I am looking at a Holley 625 cfm Street Demon or 750 cfm Street Demon. The 625 should be plenty but I have read many posts about people wishing they went with the 750. This will be a street only ride.
New Carburetor thoughts
- Thread starter czyhemi
- Start date
69hemibeep
Sponge Bob Square Wheels
It is easy to over carb a motor I would lean toward the 625, I like the 750 on a mild 440. How about a 650 double pump?
quikbird
Well-Known Member
agree with 69. 650 probably better size
I am over thinking and over researching this, I have read everything I could find on this and it always comes down to keep the stock carb set up or go the the aftermarket 600-650 option. It looks like the 625 CFM Street Demon is the way I will be going. If I had just ordered it when I started the research it would be bolted on and burning gas already.
Terry Hauck
Choadicus
I used a 650 double pumper and it was great.
Russ69Runner
Well-Known Member
650 Holley single pumper. Vacuum advance on secondary. Pretty happy with it. On my 383. It is an old Demon. Don't look for gas milage. LOL.
MoparDan
Well-Known Member
Gas mileage? I've never been in a discussion on here about gas mileage.
