DeTomaso Mailing List: February 2001, Message #225

HP Series carbs are basically "flowed" versions of the basic Holley 
carbs.  By paying attention to the flow obstructions, you can increase 
the CFM rating without increasing the cross-sectional area.  The result 
is a carb that flows more without giving up atomization at lower RPM's.
Unfortunately, the first thing done is to mill the choke tower off.  If you 
can do without a choke, they are probably worth it.  Otherwise, you're 
probably better off sending a carb with an intact choke tower off to C&S 
or other tuner to be modified.  Some of the Demon line of carbs have 
choke towers and may be worth looking into but I haven't heard enough 
feedback from actual users to form any opinion on them yet.

Dan Jones

> ----------
> From: 	Charlie Mccall[SMTP:Charlie.Mccall@haworth.com]
> Sent: 	Tuesday, February 06, 2001 5:41 AM
> To: 	Multiple recipients of list
> Subject: 	Another carb question
> 
> Can you tell I'm looking for a new carb? :-) 
> 
> Does anyone have any experience with the difference between a Holley 4150
> and the 4150 HP Pro Series? The Holley web page sings the praises of the
> HP series, claiming it to be the standard that even modified carbs are
> compared to. It's almost twice the price, $581 at Jegs as compared to
> $276. 
> 
> Any real-world tests to indicate hp gains? 
> 
> TIA!
> 
> Charlie McCall
> 1972 DeTomaso Pantera #3847 (for sale)
> 1985 DeTomaso Pantera GT5-S #9375
> "Raising Pantera Awareness across Europe"
> http://briefcase.yahoo.com/gt5s_1985
> 
>