4140 air vent to lid clearance

[als427]

While I work out intake manifolds/ clearance on another thread - another question , my current drop down air cleaner leaves a gap from the top of the carb front air vent to the lid of 7/8" , the rear is 1 1/4" so no issue. I could get get more hood clearance if I drop down further but how close can you get the lid to the top of the front air vent before you cause an issue?

[Walter R. Malik]

While I work out intake manifolds/ clearance on another thread - another question , my current drop down air cleaner leaves a gap from the top of the carb front air vent to the lid of 7/8" , the rear is 1 1/4" so no issue. I could get get more hood clearance if I drop down further but how close can you get the lid to the top of the front air vent before you cause an issue?

At least a 1/2" ... unless that gets the lid to close to the carb air inlet at the choke tower.

[jsgarage]

As Walter said, 'about' 1/2"... as long as the vent tube is still cut slantwise. I've run into a couple of cars where owners cut the slanted part off because the air cleaner top hit it and made a dent in the shiny surface.

[als427]

ok , so ive got 7/8 - can lower another 1/4 no problem.
why is the front vent tube taller than the rear?

[als427]

4150 btw don't know why I wrote 4140

[rgalajda]

This is the factory air breather Chevrolet used around 1969 to 1971 that will likely give you the most hood clearance . The base is not like any aftermarket, look at how it is sculpted . The lid is shaped to work with the base for vent clearance ( slant cut vents). You can see in the picture that the base was meant for a factory carb or early aftermarket Holley (tabs) and would require modifications for later Holley's. The carb pictured is for a LS6 Corvette.
This is the air breather I use on my big block with a Victor Jr style intake.

[als427]

This is the factory air breather Chevrolet used around 1969 to 1971 that will likely give you the most hood clearance . The base is not like any aftermarket, look at how it is sculpted . The lid is shaped to work with the base for vent clearance ( slant cut vents). You can see in the picture that the base was meant for a factory carb or early aftermarket Holley (tabs) and would require modifications for later Holley's. The carb pictured is for a LS6 Corvette.
This is the air breather I use on my big block with a Victor Jr style intake.

Thanks is there a link to that air cleaner? name? do you know the drop?

[rgalajda]

https://www.camarocentral.com/Correct_C ... r-190k.htm

There are other sites who also sell this , mostly for restoration. It has a 2 inch drop. was used on 1967 - 1969 Z\28 and high horse big blocks such as 1969 396/375 hp and 427/425 hp.
I wouldn't buy the base only, as the lid is formed for vent clearance ( with slant cut ).
Also did you know the 850 Holley has a lower choke horn such as List 80531, about 3/8" lower pictured bow.

[als427]

It does look lower 3/8 would help. But I thonk an 850cfm would be oversized for my 427 bbc - should be nearer 750 max unfortunately