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 Loses 30 hp with air cleaner 
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Joined: Wed Oct 23, 2013 8:01 am
Posts: 108
I does seem to be running pretty good now. :D


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Tue Aug 09, 2016 5:52 pm
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Joined: Fri Feb 08, 2013 2:37 pm
Posts: 1702
Needs more cowbell. If that doesn't help, more tire.


Tue Aug 09, 2016 6:11 pm
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Joined: Wed Oct 23, 2013 8:01 am
Posts: 108
Hopefully I can get it to the track soon & see what it has. BTW I'll be using more tire there. Maybe more cowbell too. :thumbr:


Tue Aug 09, 2016 9:13 pm
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Joined: Fri Oct 23, 2015 8:43 am
Posts: 33
No filter? Just that screen? Yikes... wouldn't want to hurt those nice new cylinder walls with all the dirt that is going to get in.

I have that same base, but I am using a 3/4" plastic spacer between the base and the air horn (and a 3" element with OE lid). I wonder if that straight 3/4" wall is hurting anything?


Tue Aug 09, 2016 9:14 pm
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Joined: Wed Oct 23, 2013 8:01 am
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No I just had the filter off I have a 4 inch filter. More pics if you want to see.
Your base is a L88 right? Mine is the base from a 327 with a Qjet I just cut the outer part off & bent up a lip for the filter to sit.
Started out like this.


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Tue Aug 09, 2016 9:24 pm
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novadude wrote:
No filter? Just that screen? Yikes... wouldn't want to hurt those nice new cylinder walls with all the dirt that is going to get in.

I have that same base, but I am using a 3/4" plastic spacer between the base and the air horn (and a 3" element with OE lid). I wonder if that straight 3/4" wall is hurting anything?

Yes, I think so. There is a flow loss with anything vertical up from the air cleaner gasket ring. The filter base is important to the function of a QJet. The bare carb flow about 50 CFM less (measured on a 600Superflow bench) than with the correct air filter base, like the one in 77cruiser's picture. On a bench, if you just lay your index fingers (holding your hands like you were grasping a 5" diameter pipe) around the filter gasket ring above the secondaries it picks up 25-30 CFM just from the radiused entry your fingers provide.

I hope you can try it A-B-A to see if this is true in your case.

Same thing happens on a Holley with the 1" spacer on LS-6 Chevelles and the tall QJet spacer (3"?) on '72 Chevy PU. The radiused entry to the carb provided by the correct filter base is necessary in nearly every case.


Tue Aug 09, 2016 9:46 pm
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Joined: Fri Oct 23, 2015 8:43 am
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77cruiser... That 327 base looks really close to the L88 base. Assuming that is a 66-67 era 275 hp air cleaner that you cut up (14x3).

Tuner... I was afraid you'd say that. I can't run without the 3/4" spacer due to the rod end I am using on my solid linkage (we're talking old stuff here, no cable). The rod end just slightly kisses the inside lip on the filter base with no spacer, but the geometry is right and it is working perfect. I guess maybe I'll need to try something else. This is a M4MC carb, but I ground off the peened over throttle shaft so I could easily swap the throttle arm for a '69 piece more suited to rod-style linkage. Maybe I can find a more compact rod-end that doesn't stick out quite as far to the drivers-side of the car.


Tue Aug 09, 2016 10:47 pm
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Put it on the inside (carb body side) of the lever??


Tue Aug 09, 2016 10:57 pm
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Joined: Wed Oct 23, 2013 8:01 am
Posts: 108
Confession I have to run a spacer on mine too, or it will hit the HEI & the throttle cable.


Wed Aug 10, 2016 7:21 am
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