Al Unser drives DeKon 1003 for DeKon Engineering, LTD at IMSA Daytona Finale on Nov. 30, 1975. Michael Keyser would become next owner.

 

The Man who beat Porsche

Chart of Monza Chassis Numbers

 

More Monza Photos by RacingSportsCars

DeKon was the most successful and recognized builder of the H07 silhouette Monza GT racecars. The DeKon modified Chevrolet Monza won the IMSA GT championships in 1976, 1977 and 1978.

 

In 1974, Chevrolet assisted DeKon Engineering in the design and development of the tube frame Monza race car. General Motors' first automotive design venture using computer aided design and drafting (CADD) was with the Chevrolet Monza. Around late 1974, DeKon began receiving Monza production chassis from GM in order to make the radical transformations from street to track car.

 

GM built the H07 body Monza from 1975-80, and it has enjoyed a great run of success in road racing and many other forms of auto racing. The Chevrolet Monza was almost exclusively used as the base to build these racecars. A Pontiac Astre and Buick Skyhawk were also built for racing.

DeKon Engineering, LTD was formed in July 1974 by Lee Dykstra and Horst Kwech; the most successful and recognized of all the H07 racecar builders. The name DeKon is a concatenation of the D in Dykstra and the K in Kwech. It is also short for Design and Construction. DeKon was located in Libertyville, Illinois. In three years, they produced seventeen racecars. Of these, fourteen were Monzas.

The cars were designed by Horst Kwech of Ausca Racing and Lee Dykstra and used to combat the highly successful Porsches in IMSA (International Motor Sports Association) competition. General Motors aided in the project with CAD drawings, their first attempt at using this technology. Chevrolet had a great deal to do with the design of the DeKon chassis. Design/construction was Kwech's group who actually built the DeKon Monzas and sold them to customers.

GM started producing Monzas near the close of 1974 and DeKon received them as complete cars. They would tear down and reconstruct them to the needs and specifications of their customer's.

The Dekon Monza featured a tubular frame chassis, an overall weight of about 2,400 pounds, and over 600 horsepower from a fuel-injected V-8 engine. The cars were very fast and competitive, thanks in part to their excellent 50/50 weight distribution.

Engines used were heavily modified Chevrolet 5.7-6.0 L V8 small-blocks, normally aspirated, some using four Weber (2V) downdraft carburetion. They developed as much as 650 horsepower. The car's lightweight, high horsepower combination was a formidable competitor in IMSA and other racing series. After some teething problems the DeKon Monza of Al Holbert won the IMSA GT Championship in 1976 and 1977.

 

These cars mostly ran in IMSA's Camel GT Challenge Series in the All-American Grand Touring (AAGT) class from 1975-1986. Also in the SCCA Trans-Am pro series and its club racing amateur events.

DeKon Monzas were built from 1975 to about 1978. Even today, H07s can be seen racing and winning. Price tag for a new DeKon Monza was around $38,000, race ready. Vintage racing is the main attraction for restored road racing Monzas, but there are a few still slugging it out in SCCA and NASA race groups. A fully restored Monza can fetch as much as $268,000, about seven times the original build price. Not all DeKon Monzas have a chassis identification plate.  Horst Kwech has been granted 17 patents and is an active design engineer today.

Horst Kwech DeKon 1005 giving it a shakedown at Mid-America in July 1975.  Allan Moffat took ownership five months later.

 

 

 

 

 

 

 Monza build description by DeKon Engineering, Ltd.

 

 

 

 

 

 

Allan Moffat driving his DeKon c/n 1005 at Bay Park Raceway, New Zealand - December 28, 1975. 

In a February 1976 interview Moffat remarked, “Last November [1975], at Daytona, I reached the highest speed I have ever made on a race track - 204 mph, in this very same Monza I have now. I had gone to the US at the invitation of my old pal, Horst Kwech, who is actually an expatriate Australian …”

 

 

 

 


 

DeKon Chassis Numbers and Owners

From: World Sports Racing Prototypes

1001

The first IMSA AA/GT Monza was fielded by DeKon Engineering, LTD and driven by Horst Kwech. White with red pinstripe. Made it's debut at Road Atlanta on April 20, 1975 but crashed. Rebuilt and sold to Maurice Carter who briefly raced in IMSA. It's influential impact on IMSA AA/GT racing design is still seen on today's racecars.

1002

Harry Theodoracopulos IMSA AA/GT Monza. Metallic blue. It debuted at Lime Rock on May 26, 1975 and also crashed. Rebuilt and resumed racing with the same owner.

1003

Driven by Al Unser for DeKon Engineering. White with red/blue stripes on roof. Became Michael Keyser's for 1976 IMSA, scoring 3 victories. Converted to DeKon phase 5 body for Brad Frisselle and 1977 IMSA rules and entered in 24 Hours of Le Mans in 1978.  Wynn's sponsored, white, orange, yellow and blue colors.  Preserved in Frisselle form for Historic Sportscar Racing as of 2010.

1004

Tom Franks IMSA and SCCA T/A CAT.II Monza 1977-78. White with green accents. DeKon phase 4 body updated to phase 5. Car is fully restored to original form.

1005

Alan Moffat's 1976-77 Australian GT Championship Monza. DeKon phase 3 body. White with red/blue stripes. Car is now in the US and pending restoration.

1006

Michael Keyser's 1976-77 IMSA Monza. White with red/blue stripes. It was outfitted with a Lola Can-Am rear wing. DeKon phase 4 body. Ran the 24 Hours of Le Mans in 1976.  Roy Woods painted yellow and converted to a twin-turbo V8 for IMSA and SCCA T/A CAT.II from 1977-81. Currently under restoration in the US.

1007

Jerry Jolly's IMSA and T/A CAT.II Monza. Orange with blue/yellow pinstripes. DeKon phase 3 body. Restored and currently campaigned in vintage racing by Steve Walker on the west coast.

1008

Al Holbert's 1976 effort, scored 7 victories and won the 1976 IMSA AA/GT championship.  Phase 3 body style, blue and yellow with red accents. Scored first IMSA win for Monza at Road Atlanta in '76. Bought by John Paul and competed in 1977 IMSA races. Painted light blue w/ yellow stripes and updated to phase 5 body. Purchased by Floridian Joe Gonzalez and campaigned in IMSA GTO throughout 1980's. Sold to private collector in New York.

1009

  A Camaro built for circle-track racing.

1010

Greg Picket's '77 effort, mostly for Trans-Am (Cat.II) and IMSA GT. White with yellow and red diagonal paint scheme. DeKon Phase 4 body with rear banana wing.

1011

Chris Cord's '77-81 IMSA racecar. Painted red and ran as car no. 19.. DeKon phase 5 body and wing. Had the most radical bodywork seen on a Monza in 1980-81. Last of the "TRUE" IMSA AA/GT Monzas. Present ownership undisclosed.

1012

Originally built for Ted Fields' Interscope Racing team, raced twice by Danny Ongais. Became Second car for Chris Cord Racing driven by Jim Adams for IMSA 1980-81. Livery similar to DeKon 1011, red no. 20 with Budweiser sponsorship. Rebuilt as a GTP attempt in the early 1980's by CCR.  Donated to museum in Las Vegas and sat for many years. Purchased by Ken Epsman in 2005. Restored to IMSA AA/GT for vintage.

1013

  Never completed. "Bad luck," according to Horst Kwech.

1014

Al Holbert's 1977 effort. Won the 1977 IMSA AA/GT championship, including four victories. Phase 5 body with same blue with yellow and red accents as DeKon 1008. David Heinz bought it for selected IMSA races in 1978-79. Painted red and white with Budweiser sponsorship. Sold in 1979 to South American team. May have been privately raced in IMSA GTO. Currently in private collection in New York.

1015*

DeKon's only Buick Skyhawk for Gene Felton and IMSA Champion Spark Plug Challenge.

1016

Built for Keith Feldott and SCCA A-Sedan effort. Rebuilt by Dan Gallant after serious crash. Campaigned in IMSA GTO and SCCA T-A, 1979-85.  Restored and raced by Pleasant Lake Motorsports in SCCA Club Racing GT-1 class in 1994-97. Privately owned and raced in vintage class.

1017

  A Camaro built for S. Burgess as a circle-track racecar.

1018

Built for Al Holbert's 1978 IMSA effort, but never raced. The only DeKon Monza designed with a trans-axle and big block aluminum "Can-Am" engine. Currently in private collection in New York.

CHART

All Monza chassis numbers

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

Racing Monza Body Style Phases

Phase 1

1974 Season - prototype/concept body was similar to the 1977 Chevrolet Monza Mirage special edition. Mild Coke bottle shaped body flares with wrap-around rear spoiler. Non-scooped front air dam. Half-length hood bulge to clear downdraft carbs or fuel injection.

Phase 2

1975 Season and early 1976 - Wider body flares with scooped door extensions.

Phase 3

1976 Season - Most of '76 IMSA season, and 1980-on for SCCA Trans-Am. Wider body flares. Slightly taller wrap-around rear spoiler. Non-scooped front air dam with rubber skirting. Scooped door extensions. Full-length hood bulge.

Phase 4

1977 Season: Widest available body flares. Wrap-around rear spoiler with new large banana style rear wing. Scooped front air dam. Several different style door extensions seen; scooped, non-scooped, NACA duct or slotted. Brad Frisselle and Tom Frank utilized flat ramp style front air dam. Hood bulge was full-length about 2" high or more.

Phase 5

No wrap-around rear spoiler, only banana style rear wing in various forms. Larger front cow catcher air dam, several variations. Different styled door extensions. Hood bulge was 3" high or more .

 

 

Monzas on Parade...

1975 DeKon Monza

1975 Monza Dekon (c/n 1002) Harry Theodoracopulos #21, was first owner. SCCA Trans-Am Pocono Int'l Raceway - May 9, 1976

 

1975 Monza Dekon (c/n 1002) Harry Theodoracopulos' old car.

Chad Raynal #21 is current owner. Monterey Historic Automobile Races at Laguna Seca Raceway, CA - August 2009.

The second DeKon Monza All-American GT (AA/GT) chassis built was #1002. DeKon Engineering built this vehicle for Harry Theodoracopulos.  "Harry T" ended up wrecking the vehicle during his first practice session and sent the car back to Dekon, where it was repaired and updated.  One of the updates the car got was an extra bar, running from the main roll hoop, and down to the passenger foot well area. They named this extra bar the 'Harry bar,' because they were worried he'd need the extra bracing for his next big wreck.

In 1975 and 1976, Harry T, ran his car (c/n 1002) in IMSA GT events at Lime Rock, Sebring and Road Atlanta. He also entered the car in both the Watkins Glen and Pocono SCCA Trans-Am events in 1976. 

 

In 1978, William Wonder purchased and raced the car in IMSA.  It remained in William Wonder's possession until the late 1980s and has since been vintage raced.
 

Specifications 1975 Series

 

Tuner

DeKon Engineering LTD

Chassis Number

1002

Engine Location

Front

Drive Type

Rear Wheel

Production Years series

1975 - 1980

Weight

2,400 lbs (1088.6 kg)

Engine Configuration

V-8

Displacement

4927.00 cc | 300.7 cu in.

Fuel Feed

Fuel Injected

Aspiration/Induction

Normal

Horsepower

650.00 HP (478.4 KW)

Torque

556.00 Ft-Lbs (753.9 NM)

HP / Liter

132.7 BHP / Liter

Transmission

Manual

Gears

4

 

 

 

1976 DeKon Monza

1976 DeKon-Monza (c/n 1007) Phase-3, Jerry Jolly #3 "Spirit of Colorado/KLZ Radio" during Shasta Monterey Grand Prix at Laguna Seca 100 - October 3, 1976  Gerry Wellik became the second owner.

 

 

Tale of two Monzas, driver Al Holbert #14 DeKon (c/n 1008) Phase-3, chased by Michael Keyser #1 DeKon (c/n 1003).  Here, Keyser won the IMSA Daytona Finale 250 on Nov. 28, 1976. 

 

 

1976 DeKon-Monza (c/n 1011) Phase-5, driver Chris Cord #19 at 
IMSA Camel GT/World Sports Car Championship, a 6 hour endurance race at Riverside Int'l Raceway, CA on April 26, 1981

This 1976 Dekon Monza, red #107 (c/n 1007) is thought to be one of the most original Dekon Monzas in this country. It was driven by Jerry Jolly in the IMSA Camel GT Circuit in 1976, 1977 and 1978.

 

It was later owned and raced in the SCCA Trans Am series by Gerry Wellik and Jerry Hansen from about 1979 through about 1982. The car was placed in storage for 20 years and was found by the current owner in 2002. It is currently vintage raced at events in southern California.  This car is powered by an eight-cylinder engine capable of producing 600 horsepower and 550 foot-pounds of torque.

 

Specifications 1976 Series

 

Tuner

DeKon Engineering LTD

Chassis Number

1007

Engine Location

Front

Drive Type

Rear Wheel

Production Years series

1975 - 1980

Engine Configuration

V-8

Displacement

5750.00 cc | 350.9 cu in.

Fuel Feed

Fuel Injected

Aspiration/Induction

Normal

Horsepower

600 BHP @ 7200.00 RPM

Torque

550.00 Ft-Lbs (745.8 NM)

HP / Liter

103.4 BHP / Liter

Transmission

Manual

Gears

4

 

For 1976, a new engine supplier was found and several new chassis had been built and sold to different teams. It seemed that it would be the perfect year to demonstrate the Dekon cars real potential. Al Holbert had taken delivery of his new car and Michael Keyser had purchased one. They won seven of the fifteen races they entered and Al Holbert won the 1976 title. In 1977, he would do it again facing a stronger opposition.

 

Porsche was allowed to run its 934s and BMW had entered a fantastic 320 Turbo in the capable hands of David Hobbs that proved fast, if not always reliable. Al Holbert had developed his car, now displaying a big rear "banana" wing and the car proved even more effective. Unfortunately, it was to be the last IMSA title for a Dekon Monza, as in 1978, the rules would allow Porsche 935s, cars that would dominate the series for a while. Monzas would still be seen on the Camel GT circuit, but would never win a race anymore.

 

Chris Cord's 1980 season body work would be the most radically styled "PHASE" seen. He took a Phase 5 body, then cut large slotted openings on either side of the long 3" hood tunnel/bulge to serve as exits for the radiator-cooled air. This diverted heat away from the engine and helped to create a "suction" effect under the car for better handling. The hood tunnel was very tall to clear the four down-draft carbs. The rear of the hood matched the angle of the sloped windshield, and sat just a few inches from it. The door extensions had large scoops for side mounted oil coolers. Each rear fender had a large slotted opening on top to serve as an exit for the side-mounted radiator-cooled air. Rear wheels were 19" tall, the largest ever seen on a Monza.

   
 

1977 Dekon Monza

DeKon-Monza (c/n 1004) Phase-5, driver Tom Frank #24, finished 4th at Mid-Ohio -June 5, 1977.  Car with updated 'cow catcher' front air dam. (Again, 30 years previous to same chassis above.)

 

DeKon-Monza (c/n 1004) Phase-5, formerly owned by Tom Frank. Now owned and vintage raced in Colorado.

This was the last year DeKon Engineering Ltd. produced the Monza GT racer.  The most identifiable feature in '77 was a redesigned front air dam, referred to as a "cow catcher", with vertical strut bracing.  The cars were becoming technically dated and outperformed by newer Trans-Am and IMSA GT entrants.

 

Tom Frank drove c/n 1004 from 1976 through 1979 at such events as the Road Atlanta 100 "WQXI Camel GT" IMSA race on April 17, 1977.  He was 5th on the grid, finishing in the same position that day.  The sponsor for the white/green #24 Monza was "Executive/Huffaker."

 

Specifications 1977 Series

 

Tuner

DeKon Engineering LTD

Chassis Number

1004

Engine Location

Front

Drive Type

Rear Wheel

Production Years series

1975 - 1980

Engine Configuration

V-8

Displacement

5750.00 cc | 350.9 cu in.

Fuel Feed

Kinsler Fuel Injection

Aspiration/Induction

Normal

Horsepower

600 BHP @ 7200.00 RPM

Torque

550.00 Ft-Lbs (745.8 NM)

HP / Liter

103.4 BHP / Liter

Transmission

Manual

Gears

4

   
 

Road Racing Organizations


 
 

International Motor Sports Association (IMSA)

 

 

 

Official IMSA logo

 

GTO

 

GTU

IMSA GT

Groups

 

The International Motor Sports Association (IMSA) is an American road racing organization and sanctioning body based in Braselton, Georgia. It was started by John Bishop, a formerly of SCCA, and his wife Peggy in 1969 with help from Bill France, Sr. of NASCAR.  Camel cigarettes was the title sponsor for the IMSA racing series known as, "Camel GT Challenge Series," from about 1975 -1984.

Glossary of Abbreviations

 

AAGT

All American Grand Touring - IMSA class

ASSC

Australian Sports Sedan Championship

CAT.I

Category 1, SCCA Trans-Am class

CAT.II

Category 2, SCCA Trans-Am class

c/n

Chassis number, or chassis name

GT-1

Grand Touring 1 - SCCA Club Racing

GTO

Grand Touring Over 2.5 Liters - IMSA class

GTU

Grand Touring Under 2.5 Liters - IMSA class

IMSA

International Motor Sports Association

HSR

Historic Sportscar Racing

SCCA

Sports Car Club of America

TA

Trans-Am, SCCA pro series

 

Title sponsors for IMSA GT series

 

 

IMSA Camel GT Challenge

Original logo 1972 - 1978

IMSA Winston GT

1979 only

IMSA Winston GT

1979 (typical decals)

IMSA GT Series

1980 only

IMSA Camel GT Championship

1981 - 1993

 

 

 

 

 Sports Car Club of America

 

 

SCCA "wheel"

 

 

 

Period SCCA decal 1970s-'80s

The SCCA traces its roots to the Automobile Racing Club of America (not to be confused with the current stock car series of the same name). ARCA was founded in 1933 by brothers Miles and Sam Collier, and dissolved in 1941 at the outbreak of World War II. The SCCA was formed in 1944, at first as only an enthusiast group. The SCCA began sanctioning road racing in 1948, with the inaugural Watkins Glen Grand Prix. Cameron Argetsinger, an SCCA member and local enthusiast who would later become Director of Pro Racing and Executive Director of the SCCA, helped organize the event for the SCCA.

In 1951, the SCCA National Sports Car Championship was formed from existing marquee events around the nation, including Watkins Glen, Pebble Beach, and Elkhart Lake. Many early SCCA events were held on disused air force bases, organized with the help of Air Force General Curtis LeMay, a renowned enthusiast of sports car racing. LeMay loaned out facilities of Strategic Air Command bases for the SCCA's use; the SCCA relied heavily on these venues during the early and mid 1950s during the transition from street racing to permanent circuits.

By 1962, the SCCA was tasked with managing the U.S. World Sportscar Championship rounds at Daytona, Sebring, Bridgehampton and Watkins Glen. The club was also involved in the Formula 1 U.S. Grand Prix. SCCA Executive Director John Bishop helped to create the United States Road Racing Championship series for Group 7 sports cars to recover races that had been taken by rival USAC Road Racing Championship. Bishop was also instrumental in founding the SCCA Trans-Am Series and the SCCA/CASC Can-Am series. In 1969, tension and in-fighting over Pro Racing's autonomy caused Bishop to resign and help form the International Motor Sports Association (IMSA).

   
 

SCCA Trans-Am

Professional Racing Series

   

Official Trans-Am logo

 

 

 

Period Trans-Am decal 1970s

The Trans-Am Series is an automobile racing series which was created in 1966 by Sports Car Club of America (SCCA) President John Bishop. Originally known as the Trans-American Sedan Championship it has evolved over time from its original format as a manufacturers championship for modified racing sedans to its current form as a drivers championship open to GT style cars.

 

Rules changed over the years. Trans-Am became a tube frame silhouette racing car class instead of production-based. In 1976, Trans-Am returned to the two category format, classifying FIA Group 4 and 5 cars as "Category II" through 1979. The tube frame silhouette Monza racer was part of "Cat II" as displayed on sided of cars.

 

Throughout the years, some of the greatest names in motorsports have participated in the Trans-Am Series. Multiple championships winners include Paul Gentilozzi, Tommy Kendall, Mark Donohue, Scott Pruett, Wally Dallenbach Jr., George Follmer, Peter Gregg, Horst Kwech, Scott Sharp and Bob Tullius.

 

SCCA Trans-Am Categories 1976-79

CATEGORY I

CATEGORY II

Cars prepared to specifications for SCCA production and sedan classes.

Cars prepared to FIA Groups 1-5 specifications and specially authorized cars.

   

 

SCCA Club Racing

Amateur Racing Series

 

 

SCCA Club Racing decal

 

 

 

The club racing program is the amateur road racing division where drivers race on either dedicated race tracks or on temporary street circuits. Competitors require either a regional or a national racing license. Both modified production cars (ranging from lightly modified cars with only extra safety equipment to heavily modified cars that retain only woops the basic shape of the original vehicle) and designed-from-scratch "formula" and "sports racer" cars can be used in club racing. Most of the participants in the Club Racing program are unpaid amateurs, but some go on to professional racing careers. The club is also the source for race workers in all specialties.

The annual national championship for Club Racing is called the SCCA National Championship Runoffs and has been held at Riverside International Raceway (1964, 1966, 1968), Daytona International Speedway (1965, 1967, 1969), Road Atlanta (1970–1993), Mid-Ohio Sports Car Course (1994–2005), and Heartland Park Topeka (2006–2008). Since 2009, the Runoffs are held at Road America in Elkhart Lake, Wisconsin, for a minimum of three years. The current SCCA record holder is Jerry Hansen with 27 national titles.

 

Rule changes and technical obsolescence spelled the end for the Monza as a viable race car in IMSA GT championship and SCCA Trans-Am series. The silhouette/tube frame racer car descended into the amateur ranks of  SCCA Club Racing's GT1 and AS (American Sedan) classes.

 

Today, the Chevrolet Monza racer has returned to historic/vintage racing circuits on the east and west coasts. Once again, it has proven itself as a crowd pleaser at vintage events such as the Monterey Historic Automobile Races at  Mazda Raceway Laguna Seca in southern California.

   

 

SCCA Trans-Am Series and Sponsor Logos

Typical decals and sponsors from this period

     

SCCA Trans-Am series 1980-82

SCCA Trans-Am series 1983-84

SCCA Trans-Am series 1985-87

 

 

Vintage Sports Car Clubs


 

 

 

Historic Motor Sports Association

Restoration, Preservation & Use

 

 

 

 

The Historic Motor Sports Association is one of the most respected historic racing organizations in the United States, producing world class spectator events across the country in addition to managing one of the largest high net worth member-based associations. HMSA events feature historic production cars built through 1966 and purpose built Formula and Sports Racing cars built through 1984. HMSA members own, restore, preserve and race the most historic and valuable sports and racing cars in the world.

 

HMSA was created in 1977 to serve as a sanctioning body for premiere historic racing events in North America. It is the only organization in the United States that requires the cars to be historically correct based on the period of time that the car originally raced.

 

Historic Sportscar Racing

 

Historic Sportscar Racing is one of few other vintage racing clubs.  Historic racing series such as HSR represent the fastest growing segment of motorsports in the United States and Europe. Fans flock to see historic racecars compete as they did on road racing circuits decades ago. 

 

Sportscar Vintage Racing Association

 

The Sportscar Vintage Racing Association was founded over 20 years ago with the vision of keeping vintage race cars on race tracks where they belong, delighting fans just as they did in their heyday.

   

Sources:

 

ComicOzzie Photography - '70s to present by Jerry Winker

GM H-Body Registry - Chevrolet Monza and Vega

H-Body Organization - Chevrolet Monza and Vega

Historic Trans-Am - SCCA Pro Racing

IMSA GT Championship - background Wikipedia

IMSA History - International Motor Sports Association

IMSA History, DeKon Engineering  Much to do about IMSA history

Monza GT Registry  Chassis registration

Racing Sports Cars - Database race results and car chassis

Sports Car Club of America  SCCA

Trans-Am SCCA  America's Road Racing Series

Trans-Am Series - background Wikipedia

Ultimate Racing History - Database race results and car chassis

World Sports Racing Prototypes  - Database race results and car chassis

 

 

 

 

 

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