[DeTomaso] Holley Carb jet extension-stalls on braking

[Charles McCall]

Hi Clay,

This was talked about last month or so, and my take on the discussion:

1) Some people have gotten lucky with jet extensions and/or tubes to reduce
the problem. But numerous people have had no luck despite adjusting floats
up/down/sideways or adding tubing. In any case, the car stalls from too MUCH
fuel, not from fuel starvation (it sloshes out of the float bowls) so you
should adjust the level down, if anything, not up. 
2) The root cause of the problem is having an intake designed for a front
engined car, which tilts the car. I have yet to hear from anyone who has
milled their intake flat who has continued to have this problem after doing
so. More work, but it appears to be more effective.
3) My old ´72 Pantera used to stall under hard braking, but my '85 does not,
for whatever reason, either with the stock (from DeTomaso) Holley Dominator
intake, or the current Weiand intake. 
4) Something else that caught my attention - is your engine what you would
describe as "extreme"? If not, then conventional wisdom says your carb is
huge for a 351 cubic inch Cleveland. Common sizes are 600cfm, 650, up to
750, but very few people run larger, especially with a stock engine.
Something to think about. 

Good luck!

Charles McCall
1985 DeTomaso Pantera GT5-S #9375
"Raising Pantera Awareness Across Europe"
http://www.poca.com/index.php/gallery/?g2_itemId=2323

-----Mensaje original-----
De: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] En
nombre de clay willmott
Enviado el: martes, 28 de julio de 2009 19:22
Para: List Pantera
Asunto: [DeTomaso] Holley Carb jet extension-stalls on braking


I recall a thread on the 351 C not being level and tilts forward which may
cause the car to stall in some cases with hard braking.
A few people suggested a type of venturi or tube apparatus to run from the
front to back of the carb as I recall.
My car does this of course.  It will die if you really mash the brakes right
as you come to a complete stop.  It does Not do it with accelerating.

I called Holley to order one of these and the tech person who was very nice
and seemed to know an awful lot said I would need Jet extensions #122-5000
which are 8 bucks.

Questions:

Can I try to have someone reset the float higher to stop stalling on
braking?

Do I actually need those venturi pipe things or the jet extensions above?

Do I have to remove the carb?

A local shop told me if I bring it in they can try to adjust it then put it
on the dyno?? 

I am not sure if my carb needs rebuilding or anything it is about 6 yrs old
and is a Holley 4150 with 800CFM double pump with manual choke and
mechanical secondary according to tech today when I gave him the stamped #
on my carb.

Thanks

CW

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