Quote:
Originally Posted by av8or32
My big debate has been between the 750 ebrock vs. the 600 ebrock. It's really confusing when you use the std carb sizing formula and get 580 cfm when the factory qjet was rated at 750cfm..............I'm running so rich right now it crazy
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The qjet has a spreadbore with very small primaries, so it's like running a very small carb until you open the secondaries. A big square bore holley will have you running on alot bigger cfm/fueling at low rpms on the primaries. If you're secondaries are coming in too soon, you've just quadrupled your problem.
I like the E carbs, they work great out of the box and have good throttle response in my experience. I had two 600's on a tunnel ram and a 366 small block and it was the snappiest car I've driven on the street...go figure.
I would probably go with the 600 with your set-up....you won't be pushing it past 5800-6K anyway, so the added airflow is a moot point.
I'm pushing 500hp with my little 383 on E85 which has about 25% more fuel requirement on my motor, the 750 still feels a bit big off idle.