427 Small Block Chevy
Turn-Key Crate Engine With 550 HP Extremely Wild Street/Strip Power Plant
* Engine Shown With Optional Upgrades:
Chevy 427 small block stroker
with 550HP Hydraulic roller
fully forged bottom end engine
engine can be custom designed to tailor to
your specific needs. When we designed this engine combination
we had the weekend racer in mind who can
drive to the strip and back home.
We can also custom
paint your engine to match your vehicle at
your request. We are a dealer for March
Performance serpentine belt systems if you
choose them as your pulley manufacture.
We can also assist you in choosing the
proper performance street/strip transmission and
stall speed converter combination for your
vehicle and have it shipped directly to you
as your engine is being built.
See Below The Quality Of
Parts We Use In Our Engines
Short Block Assembly:
New Dart SHP 4 bolt main block with 4.125 bore
Block painted with 3 coats
of high temp ceramic engine paint customers
choice of color
with ARP bolts
pistons (Speed-Pro, Keith Black,
SRP, or Mahle)
Performance rods and main bearing (Clevite, King
or Federal Mogul)
ignition wires (Color Of Choice
Chrome valve covers
Flex plate (for auto trans)
during the building process
Each engine is
timing set and
adjusted for optimum performance
We video tape your live run
engine and send you a copy
We Are Constantly
Running Engine Deals
Please Call Us For
The Most Up To Date Pricing
Or E-Mail Us For More
**Customer Review of our Chevy 427**
have a lot of time to explain everything I am doing
and make a pretty letter. But I wanted to let you
know what is going on in my neck of the woods.
After deciding to order and engine from you 6
months, I place the order 4 months, then looked for
a car 8 months +/-.
I wanted to use a pre
computer car due to the wiring. After no luck on
choice, I designed a plan to inst ll into Suburban
approx $8000.00 plan.
I now have a super
suburban stealth vehicle I drive every day.
am continuing to modify ad could not be happier with
your work. At a younger time in life I had a
Chevelle 396/427/454. This engine is better and runs
like a sewing machine. Everyone is in awe.
Most cannot see what is making the noise even when
looking right at me.
I have tuned the system
tow and fly. I am still running 342 gears and will
soon look to cangetem to 411 or 456. But for now it
still runs very well.
I went through a stock
mid-pipe system with flow tech headers to 2.5"
Gibson out the back. I have now change to 3" all the
way and now will install a second system which will
work off of a 2-3" cutouts to activate quite mode
through 2.5" additional mufflers. This way I can
be quite of run as needed.
(Includes braided fuel line for carburetor)
Model 4150 Ultra HP
4 Corner Idle
Braided Fuel Line
Dyna Force Starter
Small Block Chevy
Big Block Chevy
153 and 168 Tooth
Straight Bolt Pattern
MSD 6 Series Ignition Box
Higher output with 530
primary volts and 135mJ of spark
Efficient components use
less current to produce more
Set an rpm limit on the 6AL
with two rotary dials in 100 RPM
Same bolt pattern as the
original 6AL with a lower
Built-in LED for system
All wires exit the same side
through a locked, sealed
153 or 168 tooth
Fuel Delivery Systems
The Atomic EFI
outshines the competition in ease of
installation and performance! The MSD
annular ring injection design produces an
air/fuel charge with much better mixture as
well as an even distribution among the
cylinders that our competition cannot match.
Better AFRs equal better idle quality,
better starting, and better overall
drivability throughout the rpm range. You
and your engine will be glad when you Go
Assembly (An exact swap for a 4150
(4) port style
All harnesses and
connectors (Much less harnessing than
Idle Air Control -
Built in to the throttle body
Temperature Sensor - 3/8-NPT threads for
Wideband O2 Sensor
and cable (Many competitive units are
Have a custom
painted car? Why not have a custom
painted engine? Give us your paint code
and we'll do the rest.
Old School Look:
One of the most
popular and durable dress-up kits
available today! This black crinkle kit
with its distinctive look and boldly
striking wording comes with everything
you need for race day or show day!
finest transmission packages, custom
made for Proformance Unlimited.
transmission package is tailored to your
engine, and test driven to ensure
They build them
from Mild to Wild, if you’ve got the
horsepower, they have the transmission.
TH-350 Or TH-400
TH-350 Or TH-400 Add
700R4 Or 200R4 Add
vehicle is a hot rod, street car, race car,
or even a tow truck, here at Proformance
Unlimited we are here to help design and
build the combination that best suits your
vehicles needs. Please browse our engine
combinations listed below or custom design
one of your own. Proformance Unlimited is
best known for our precision custom designs.
From that special built stroker engine to
that turn-key drop in ready crate engines,
call Doug or Steve and we will be happy to
answer any of your questions.
All engines are custom built to order for
total customer satisfaction
PROFORMANCE UNLIMITED INC. RESERVES THE
RIGHT TO MAKE CHANGES IN DESIGN OR TO MAKE
ADDITIONS TO OR IMPROVEMENTS UPON ANY OF ITS
PRODUCTS AT ANY TIME WITHOUT INCURRING ANY
OBLIGATION WHATSOEVER TO INSTALL THE SAME OR
IMPROVEMENT UPON PRODUCTS PREVIOUSLY
MANUFACTURED. OCCASIONALLY DEPENDING ON
AVAILABILITY, PARTS MAY BE SUBSTITUTED THAT
WILL NOT EFFECT PRICE, PERFORMANCE,
APPEARANCE OR QUALITY OF THE PRODUCT.