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413 dual quad CFM question...

i could go 65-70 mph on the back primary with 3.23 gears before the front primary started in.
 
need to change the jetting when running 2x4 here is what Edelbrock wants for starting out with there intake and 600 cfm carbs

20241205_195630 (1).jpg
 
70x47 is what they say. i aways go leaner on the cruise I was running 73x47
Thanks for the info. I have the intake and plan to use it on a future build. Since following this thread,i am now convinced that 600s are the way to go instead of 500s.
 
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