Time to get it running
Thread Starter
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Mountain Pass
Joined: Nov 2013
Posts: 200
Likes: 9
From: Mason City, IL
Time to get it running
Need input to help make up my mind as to the better fit. Currently have a rebuilt 1972 390 FE in my 66. Nothing major with the rebuild, Edelbrock 4 bbl intake, RV cam, Hedman Headers. Looking at either Edelbrock 600 CFM or 650 CFM. Keeping with manual choke. Truck is a 3 speed moved to a floor shift.
600 or 650?????
600 or 650?????
Lead Gopher
Joined: Aug 2012
Posts: 10,049
Likes: 1,603
From: Seattle
If I plug these two numbers into the calculator
Maximum Engine RPM : 6000
Engine Size in Cubic Inches : 390
I get these as the output numbers. 600CFM should be a fine choice.
Street Carb CFM : 575.52
Racing Carb CFM : 744.79
My 1971 Trans Am came stock with a single Rochester Quadrajet 7041267 rated at a whopping 820 CFM and flow tests show as much as 828 CFM. They actually had to go to a larger mechanical fuel pump canister to hold enough fuel in reserve to feed the carb during heavy sustained throttle or WOT.
Chad
.
Maximum Engine RPM : 6000
Engine Size in Cubic Inches : 390
I get these as the output numbers. 600CFM should be a fine choice.
Street Carb CFM : 575.52
Racing Carb CFM : 744.79
My 1971 Trans Am came stock with a single Rochester Quadrajet 7041267 rated at a whopping 820 CFM and flow tests show as much as 828 CFM. They actually had to go to a larger mechanical fuel pump canister to hold enough fuel in reserve to feed the carb during heavy sustained throttle or WOT.
Chad
.
Thread Starter
|
Mountain Pass
Joined: Nov 2013
Posts: 200
Likes: 9
From: Mason City, IL
Thanks Chad. I was leaning to the 600 myself, but always good to get opinions from guys that have done it. Most of my friends don't do cars, so I'm kinda a loner in that category. More into bikes.
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