Xtreme Performance - Holley
Ultra XP carburetors! Ultra XP
carbs are 38% lighter than our
original HP, have fuel
capacity that is 20% greater
and 30 other new features!
Theyâre available in our
all-new Hard Core Gray⢠hard
coat anodized finish with
Black⢠billet for improved
corrosion protection.
Theyâre also available in
natural tumble-polished
aluminum with your choice of
Black⢠or Red⢠metering
blocks and base plate. The
Aluminum Ultra XP comes in
600, 650, 750, 850, and True
950-CFM. Holley Ultra XP
carburetors offer new features
such as an integrated idle
bypass valve that allows for
idle adjustments while
maintaining the correct
throttle plate to transfer
slot relationship, high
capacity fuel bowls which
feature 20% more fuel capacity
to eliminate starvation,
integrated fuel shelf to
minimize fuel aeration and
internal baffling to control
fuel slosh. Other features
include all aluminum
construction, fully tunable
billet metering blocks, billet
base plate, adjustable
secondary linkage and knurled
(hand adjustable) curb idle
screws. Holley Ultra XP
carburetors are the ultimate
in square bore race
carburetors!
Features:
- Aluminum
Construction (saves 4.5 lbs -
38% weight
savings)
- Shiny with
black anodized billet aluminum
metering blocks and base
plate
- Designed for use
on Drag race, circle track, or
any high horsepower
engines
- Contoured
venturri inlet offers balanced
airflow for increased
horsepower
- Air bleeds
moved outward to allow a
smoother transition of airflow
from the top of the carburetor
into the
venturii
- Metering
blocks feature improved
durability, true gasket
sealing and fully adjustable
(emulsion bleeds, power valve
channel restrictors & idle
feed
restrictors)
- Integrate
d idle bypass valve eliminates
the need for holes in throttle
plates and allows for proper
adjustment of idle while
maintaining correct throttle
plate to transfer slot
relationship. Helps maintain
good idle control when using
radical
camshafts.
- Dual 30cc
accelerator pumps provide the
perfect amount of fuel from
idle to full
throttle
- Fuel bowls
provide 20% more fuel capacity
while controlling slosh with
internal
baffling
- Clear sight
windows on both sides of bowls
for easy and safe fuel level
adjustments
- Built in
drain plug in front center of
bowl provides easy access to
empty contents of
bowl
- 8AN (o-ringed)
inlet threads offer a large
variety of plumbing options
and can be plumbed from either
side
- 4 corner idle
allows you to precisely
control your idle
system
- Mechanical
Secondaries for perfect off
the line
launches
- Elongated
(dual pattern) mounting holes
allow fitment on intakes with
square flange (Holley 4150â¢
style) or large flange (Holley
Dominator®
style)
- Knurled (hand
adjustable) primary and
secondary curb idle screws
allow for easy idle adjustment
without the use of
tools
- Primary throttle
shaft capped to prevent entry
of debris &
contaminates
- Factory
machined accessory mounting
hole for easy addition of
adjustable primary throttle
stop. New secondary pump cam
lever designed to provide
positive throttle stop on
secondary
side
- Stainless steel
adjustable secondary link.
Provides choice of 1:1 or
progressivesecondary throttle
actuation for ultimate control
of secondary opening
rate
- Baseplate
designed with a boss that can
be consumer machined for
vacuum source
- Includes
notched float and jet
extensions
- 100%
wet-flow tested by Holley
technicians to assure it
arrives ready to run!