Not Ranked
I put a new Holley 4150 650 CFM on my 427 FE last fall - rejetted it and it made a huge difference in AF ratio and responsiveness. We did it all on a chasis dyno and I was told to stick with the smaller carb if I wasn't looking for top end. I don't race it and won't beat the 1963 vintage block by maintaining the high RPMs needed to see the difference in HP of a larger carb. I'm happy with the 650.
Tim
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