Re: Converter Suggestion - Big Al!!

> >
> > Have a 950 HP on my 10 second OT street car. They are rated at a
different
> > vacuum level than regular carbs. Look into it before you go shopping.
Was
> > surprised to find out about this AFTER I bought mine:( Think they are
rated
> > like the two barrels.
>
>    Hmm. Where is this info on the Web? This is a new one on me.
>

Google is your friend:) Stolen from
http://www.carreview.com/cat/parts/carburetors/holley/PRD_2173_2889crx.aspx

Summary:
Holley may be misrepresenting their HP carb sizes, a HP 950 is closer to a
830, a HP1000 is about a 870 if measured the same vac as a 47-- series.
The
industry standard for cfm ratings was 1.5"Hg vac for a 4 barrel. holley
decided to follow the deciptive lead of it's competitors and use 28"wc
which
is 2.06" hg. Holly has all their carbs listed with flow spects. They make
no
distinction between a HP type and a older 4781 type. Unless you actually
flow a carb, with holley's listings, you can't tell what flow it may be
since the listed flows of the 4 barrels are not made with the same test
standard. Their all listed together by flow ratings. I'm just for the
truth
in advertising, if holley actually told the test vac for carbs it would be
better, Esp if they use different test spects for different 4 brl carbs.
It
looks like Holley uses a 1.5"HG vacuum standard for the 47_ _ series carbs
and for the HP series they use 2.06"hg vacuum test standard. The result is
a
false comparison between the two carbs. I got tricked and many others will
be also. Spread the word about this . The HP950 has a 1 3/4 base plate and
a
1 3/8 venturi. A older 850 has a 1 3/4 base with a 1 9/16 venturi A HP830
has a 1 11/16 base and a 1 9/16 venturi