See 1976 Chevrolet pickup with Rochester quadrajet upgrade on SBC 350 V8.
We removed the hood, mounted a camera looking down on the air horn, and
took it for a spin, running wide open on an uphill grade. See how the
secondary air valve responds to rpm drop at each upshift of the THM. Also
included is a smoking burnout.
How to de-bog your Quadrajet part 1
Sorry guys, I got the videos a bit out of order.
The Rochester Quadrajet has gotten a bad rap over the years, often called a
Quadrabog or Quadrajunk.
In fact, this is a great multipurpose carbureter once you understand how
they work and what not to do to them.
In this clip I introduce you to the Quadrajet and begin explaining the
theory of operation of these units.
Quadrajet HP for $40.
A GEARHEAD PRODUCTION. Throw away the Edelbrock and the Holley and save
your money. You can build a hp QJ for less, and get better performance and
1971 Cutlass SX new intake and carburetor
Just installed my new performer intake,750 cfm edelbrock carburetor,jegs
fuel pressure regulator and spectre free flow air cleaner.. Engine makes
ridiculous amounts of power and torque fries the tires all the way from
first to second and throttle response is very snappy. Thanks to all the
help matching up the parts from edelbrock and Scott up at lake Norman
how to minimize engine bog with a Quadrajet carb
this is to minimize engine bog when the pedal is to the metal. do not over
tighten, very small spring...you want to try 1/4 turns or 1/2...q-jets are
good if tuned properly. also when you are tightening screw it will have
tension on it so keep the screwdriver firm. 1986 gmc sierra single
straightpipe to cherrybomb. you will need a small flathead screwdriver and
a 3/32 allen key. be sure not to tighten to much or else your vacuum
secondary flaps wont open.
New quadrajet set up
New air-gap manifold and custom/rebuilt q-jet. Sounds good but I still need
to set the timing on the distributor and the carb is tuned already. Hope
you like, nothing to fancy just a few revs and walk around...the Exhaust is true dual no x/h pipe and it has
cherry bomb glasspacks(3 inch)
Edelbrock Carburetor Installation and Troubleshooting Part 3 - Installation 1
Edelbrock Performer Series and Thunder Series AVS carbs are the most
reliable, trouble-free carbs available today, however proper installation
and tuning will ensure that you get all the performance you want from your
engine. Whether this is your first carb installation or you've been doing
it for years, this video shows you how to install the carb on a variety of
intake manifolds, how to check linkage and vacuum line hook-ups, set the
idle speed and mixture, and help you diagnose any potential trouble spots.
In some cases, additional tuning will be required to calibrate the
carburetor for your unique requirements, and this video shows in detail
just how easy it is to get the carb perfectly "dialed-in" for your
OLDSMOBILE 455 W-43 EXPERIMENTAL HEMI AND OTHER EXOTIC ENGINES - THE JOHN BELTZ YEARS PHOTO TRIBUTE
John Beltz was Oldsmobile's chief engineer in 1964 and one of the prime
movers of the Toronado and 442 project. Beltz was promoted to Oldsmobile
general manager at age 43 in 1969 when Harold N. Metzel retired. Beltz
passed away in May of 1972 from cancer at the age of 46.
John Beltz is leaning on a dual fan 455 Olds and posing with other
experimental Olds engines that never saw production.
Here are descriptions of these engines:
1. The 0W-43 all aluminum 455 with 4 valve per cylinders, four overhead cam
Weber engine. With a redline of just under 8,500rpm it was originally
conceived for CAN AM racing. At 3,000rpm it put out 300hp and at 6,000rpm
registered over 600hp. The top output recorded for this engine in the
Lansing Dyno facility
was 700 real hp at 6,800rpm. Tests were run with both carbueration and fuel
injection. The block was cast from Reynolds 356 alloy and fitted with
pressed-in dry steel cylinder liners for the Forged-True 12.20to 1 pistons.
Billet steel connecting rods by Carillo was used along with a forged steel
crank. The engine weighed in at 50 pounds lighter than the production 455
motor! It was developed at the same time as the ZL-1 Chevy 427 motor.
2. The W-43 4 valve per cylinder 455 developed by JOHN BELTZ , LLOYD GILL ,
JOE JONES AND FRANK BALL. Rated at 500-550hp with a single Rochester
Quadrajet on an aluminum manifold. Constructed with both cast iron heads
and block and with aluminum-alloy block and heads 75 pounds lighter than
the conventional 455 production engine. Engine featured four valves per
cylinder with narrowed angles for a super efficient combustion chamber
design, central spark plugs and could easily be adapted for chain for gear
driven overhead camshafts. 455 engine had 4.625inch cylinder centers, a
4.125 bore and 4.250 stroke. Making use of the 3inch main bearings and 2.50
inch rod journals, the engine was fitted with a specially prepared cast
crank fitted with SAE-1140 forged steel rods, forged 10.20-to-1 pistons
which rode on Morraine 400 bearings. Four bolt main block boasted 2
additional 5/8inch drain holes. Four valve heads featured 1.750inch intake
valves (SAE-8640 steel) with 22 degree stems and 1.375 Exhaust (214-N stainless steel) with 15 degree
stems, special Stellite seats, bronze alloy guides, o ring plug tubes, 14mm
spark plugs, 3/8 inch pushrods and aluminum rocker arms. (Of all the
experimental Olds engines, this one came the closest to production and
there are photos of this engine in street gear. MAY 71 HOT ROD MAGAZINE
features some of these engines and the sadness of the Olds engineers of
that time of how they would never be released.)
3. 455 dual turbocharged CAN AM ROCKET
CHALLENGE. 659hp @ 6250rpm. 554lbs torque @ 6,250 rpm. Alloy block with 4
bolt mains. Forged steel crankshaft. Forged True pistons with 8.5 to 1
compression. 3inch main journals. 2.499inch rod journals. Carillo billet
steel rods. alloy heads. 2inch intake valves. 1.625inch Exhaust valves. Crower roller camshaft with
555inch lift and 320 degrees duration. Dual TRW-375-E-10 turbochargers with Boost Wastegate 10and 1/2psi. Lucas fuel
injection. Olds alloy intake.
Competed with big block Chevy Mclarens and Porsche Panzers in CAN AM racing
This video is merely a couple of old magazine pages strung together with
the exception of that blue 455 hemi which was found on the internet. Thats
BRUCE MCLAREN in that green can am race car which is Olds powered. AT THE
BEGINNING OF THE VIDEO JOHN BELTZ IS POSING WITH SOME ENGINES FEATURED IN
THE JULY 1969 ISSUE OF HOT ROD MAGAZINE AND THE BLUE OLDSMOBILE 455 HEMI
WAS FEATURED IN THE MAY 1971 ISSUE OF HOT ROD MAGAZINE. The incidental
music I overlayed onto this video was muted by youtube.
How to de-bog your Quadrajet part 2
The Rochester Quadrajet has gotten a bad rap over the years, but it's
actually an excellent carburetor once you understand how they work.
Often referred to as "Quadrabog" or "Quadrajunk", many of the issues these
units suffer stem from neglect, or "modifications" that do more harm than
Being a spreadbore, air-valve secondary design, the Quadrajet is capable
of flowing 750 or 800 cfm of airflow, eliminating the need to buy different
carburetors when your set-up changes. In addition, the small primaries make
for great drivability and fuel economy.
In this clip, I'll discuss theory of operation on the secondary side,
since that's where most problems arise. So, leave your preconceived notions
at the door and let's see what makes these carburetors tick.
Pontiac 400 idling on dyno right after break in session
A Pontiac 400 bored .030" over so now a 406 with comp cams extreme energy
hydraulic cam and lifters, roller timing chain and roller rockers.
Lightened and balanced Scat crank. Ignition upgraded to MSD HEI with Accel
8.8 mm sprial core wires. 6X-4 heads ported and port matched to ported
factory dual plane intake manifold. Factory 750 CFM Quadrajet reworked by
Cliff Ruggles performance.