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Post By Rick Parker
![Old](/forums/images/statusicon/post_old.gif)
09-08-2014, 06:27 PM
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CC Member
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Join Date: Apr 2007
Cobra Make, Engine: # 757 ERA 427 SC , 482 Al. big block
Posts: 894
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Not Ranked
Drop Base for Holley 4150
I`ve been fighting poor fuel distribution and a carb that just wouldn`t respond to changes like it should for quite a while .
Because of very limited underhood clearance , I couldn`t put just any filter setup on it and the spun aluminum ones were all that would fit . However , the problems with them were insufficient vent tube clearance and a very steep wall behind the element that made the air do some really horrible turns which created a lot of turbulence and other undesirable things ... all of which affected carb tuning badly .
I was talking to a carb man who is one of the best in the country and he said try the Chevy L88 air filter base . Seems he had done a lot of testing and found it to be about the best out there . I did and found that those guys really did know what they were doing back in the `60`s . That base is one of the most efficient units out there , has more drop than the spun aluminum units , correct flow paths ( no steep walls ) and required minimal rework to fit the 4150 .
Basically , just cut off the PCV tube on the bottom and plug it ( hits the accelerator pump arm ) and open up two slots . Clears all linkage and fuel lines and allows me to run a full 3" tall element and have about 3/4" to 1" vent tube clearance to the filter lid .
Carb responds to jet changes the way it should , seat of the pants power is better in all rpm ranges and fuel distribution is where it should be . Car is much smoother at low rpm ( 2200 to 2400 ) also .
All this for about $69 !!
If anyone is interested , I can put up a few before and after photos .
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![Old](/forums/images/statusicon/post_old.gif)
09-08-2014, 06:48 PM
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![Rick Parker's Avatar](http://www.clubcobra.com/forums/image.php?u=12386&dateline=1223616827) |
CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Not Ranked
One of the best improvments is to utilize their (or Pro forms) HP main body, with the nice radiused paths into the venturis and made without a choke housing. That alone is one of the best improvements for a Holley. Attempting to utilize a Holley with a functioning choke with a low profile air filter is a futile exercise.
__________________
Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way
Last edited by Rick Parker; 09-08-2014 at 06:50 PM..
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![Old](/forums/images/statusicon/post_old.gif)
09-08-2014, 07:02 PM
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CC Member
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Join Date: Apr 2007
Cobra Make, Engine: # 757 ERA 427 SC , 482 Al. big block
Posts: 894
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Not Ranked
Rick ... I agree , but this carb is a Pro Systems HP950 with all the bells and whistles , and no choke or choke tower . Also , everything is radiused into the venturies etc . Still had problems and once I got the proper air flow path and vent tube clearances , everything started working . Even with what Pro Systems did , tuning with the spun aluminum base was an exercise in futility .
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09-09-2014, 05:55 AM
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![Seagull81's Avatar](http://www.clubcobra.com/forums/image.php?u=27042&dateline=1193366488) |
CC Member
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Join Date: Mar 2007
Location: Creedmoor,
TX
Cobra Make, Engine: FFR3542K, 347 C. I., EFI, T-5, Miata Front Sway Bar, 3 Link, Red with White Stripes
Posts: 1,157
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How about some pictures and part numbers?
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Steve
Texas Cobra Club-Austin
July 2009 FFCars Picture of the Month
FFR3542K, 347, Holley Sniper EFI, T-5, 4 Wheel Discs, 3-Link, Miata Front Sway Bar, Red with White Stripes
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![Old](/forums/images/statusicon/post_old.gif)
09-09-2014, 07:41 AM
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Join Date: Jun 2010
Location: Lewisville,
TX
Cobra Make, Engine: BDR, 302
Posts: 273
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Nick A. sells a nice drop base package that includes K&N filters. Great package for turkey pans and clearance issues.
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![Old](/forums/images/statusicon/post_old.gif)
09-09-2014, 10:36 AM
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CC Member
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Join Date: Apr 2013
Location: Fort Worth,
TX
Cobra Make, Engine: UCC 427GT, 461
Posts: 36
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Not Ranked
Where did you get the air cleaner from and what filter did you use?
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