Please note that the Holley blue regulator is a bad restriction in terms of being used with a 4 bbl carb!
The control flow needle used in it has far less flow area then both float bowl needle and seats combined in even a small Holley 600 cfm carb, just bad news!
To me the only acceptable place to use one is on a dirt track 2bbl carb limited motor.
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I do stuff for reasons.
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