Quote:

The trick seems to be to run enough filter surface area not to measurably restrict.
For example, Holley ran a test in 1971 of air flow through a carb.
No air cleaner 713 cfm
Chevy hi-perf open element cleaner 675 cfm
Same as above but with two filter elements stacked 713 cfm.

They didn't publish the hights, but the point is once they had enough area, the restriction was the carb. (Mike Urich and Bill Fisher Holley Carburetors & Manifolds 1987 edition page 71)

Another thing to consider along the line of what Mr P was describing is the impact on the bowl vents. With Holley type carbs the vent could be placed into a pressure stream, or in a weird turbulent area and that can mess up the fuel curve. A ton of ideas on modifying Bowl Vents shared at Racing Fuel Systems.




Been installing an 11/32 brass sleeve over the bowl vents and I drill 4 holes in em and they work. No more pulling fuel up the tubes and the top of the carb`s cleaner. They work for those situations like mine were the lid touches the scoop or is real close.........


72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....