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The season had begun, traditionally, on the Daytona circuit, for the 24Hour race. It was the first victory for French drivers Bob Wollek and Claude Ballot Léna. Second was the March 83G Chevrolet driven by Randy Lanier-Terry Wolters and Marty Hinze. Third was the fantastic Racing Beat Mazda RX7 driven by Pete Halsmer-Rick Knoop and Bob Reed, easily winning the GTO class. The Kent Racing Mazda RX7 won the GTU class with Lee Mueller-Terry Visger and Hugh McDonough at the wheel.

The next race was a premiere with a rush in the streets of Miami. The big race was to take place then. The weather was to worsen with big wind and heavy rains. Al Holbert was the winner, but it surely was the strangest race he had ever won. He earned $50000 in a quite odd fashion. The GTO class was dominated by Gene Felton, running the Stratagraph Chevrolet Camaro, once Don Devendorf retired with his Datsun 280ZX Turbo. Second was Ludwig Heimrath driving his Porsche 934. The GTU class was won by Roger Mandeville, aboard his Mazda RX7. He took the victory over Whitney Ganz, driving a Toyota Celica. Jack Dunham took third on his Mazda RX7.

The next race was the classical 12 Hours of Sebring. It was a very disputed race, with a GTO car winning overall, for the first time in history. Wayne Baker, Jim Mullen and Kees Nierop won in a Porsche 934 prepared by Bob Garretson. Seciond was the Porsche 935K3 driven by Bob Akin, Dale Whittington and John O'steen. Hurley Haywood and Al Holbert took third in the Bayside Racing Porsche 935. Don Courtney, Luis Sereix and Brent O'neill took a fine fourth place, and second in GTO, in their Chevrolet Monza. Jack Dunham, Jeff Kline and Jon Compton took the GTU win in the Mike Meyer Mazda RX7. Joe Varde, Jack Baldwin and John Casey were second in class.

A huge 69 car field took the start of the Road Atlanta race. It surely remains in the Group 44 memories with Bob Tullius and Bill Adam taking the win in the Jaguar XJR5. Bill Whittington and Emory Donaldson finished second in a March 83G Chevrolet. Sarel Van der Merwe and Gianpiero Moretti finished third in a Porsche 935L. Wayne Baker and Jim Mullen had a strong race and won the GTO class, beating John Carusso and Phil Currin in the BASF Chevrolet Corvette. George Alderman won the GTU class in his Datsun 280ZX, beating Jack Dunham-Jeff Kline in a Mazda RX7.

The next race was held at Riverside, for the traditional 6Hour race. A big 60 car field showed up with a wide variety of racers. Al Holbert showed up with his March 83G which was fitted with a Chevrolet engine. He set up a new lap record during practice. The race was finally won by John Fitzpatrick and David Hobbs, but it was marred by Rolf Stommelen's death on the ninety fourth lap. They would not get on the podium. Al Holbert and Jim Trueman finished second in a March 83G Chevrolet. Wayne Baker and Jim Mullen again won the GTO class over Gene Felton and Billy Hagan in a Chevrolet Camaro. The GTU class was won by Wally Dallenbach Jr, Whitney Ganz and Dennis Aase in a AAR Toyota Celica. Joe Varde and Jack Baldwin finished second with Boy Hayje and Roberto Moreno third in a BMW 320 entered by William Karges.

Laguna Seca saw Al Holbert win his first race in his March 83 Chevrolet, while Bob Tullius finished second in his Jaguar XJR5 and Bobby Rahal, in a Ford Mustang TC, was third. Diego Montoya enjoyed his first GTO class win in his BMW M1, ahead of Don Devendorf, who ran the Electramotive Datsun 280ZX Tc and Roberto Moreno, who took his Toyota Celica to third place. Boy Hayje in a BMW 320 won the GTU race and beat Roger Mandeville in his Mazda RX7, while Casey Mollett had a great run in his Datsun 280ZX and finished third.

At Charlotte, Al Holbert and Jim Trueman had a very hard fought battle with the Group 44 Jaguar XJR5. At the end of the race, an overheating engine slowed him down but he made it to the finish, earning a well deserved victory. Second at the end was the Porsche powered March 82G driven by Kenper Miller and David Cowart. Wayne Baker and Jim Mullen again took the GTO victory aboard their now usual Porsche 934, while Diego Montoya and Fomfor were second in the latter's BMW M1. Boy Hayje and Roberto Moreno took the GTU victory in their Toyota Celica, ahead of Jim Downing and John Maffucci in the RGP500 Mazda RX7.

At Lime Rock, the Jaguar won the race. Second was the Porsche 935K3 deiven by Bob Akin and John O'steen. Third and first in the GTO class was the BMW M1 driven by Diego Montoya who did a fine job beating the Porsche 934 driven by Wayne Baker and Jim Mullen. The GTU class was won by the Datsun 280ZX driven by Bob Leitzinger and Logan Blackburn. Jim Downing and John Maffucci were second, again, followed by Roger Mandeville and Amos Johnson.

At Mid Ohio, the Holbert Racing March 83G Chevrolet was entered and driven by Bobby Rahal, Doc Bundy and Jim Trueman. The rain shod event was won by the trio. Second again was the reliable Porsche 935K3 driven by Bob Akin and John O'steen. They finished slightly ahead of the GTO winning car, which appeared to be the Chevrolet Camaro driven by Billy Hagan and Gene Felton. Second was a Porsche 934, but it was the Electrodyne backed car driven by Chester Vincentz and Dave White who was the best Stratagraph opponent. Mazda took its revenge by taking the four top spots in GTU. Joe Varde and Jack Baldwin drove the Western Airlines car to a convincing win over Jim Downing and John Maffucci.

The next race was the special Paul Revere 250Miler run at Daytona on the 4th of July. None of the top contenders had been willing to take part in this event. Preston Henn had entered his Porsche 935L which was driven by Hurley Haywood and AJ Foyt. Starting from the pole, the pair won the race over Marty Hinze and Don Whittington, who drove a March 83G Chevrolet. Billy Hagan and Gene Felton again swept the GTO class with their Chevrolet Camaro. Second was a car that was run for the first time in 1983, it was the T and R Racing Ford Mustang driven by Tico Almeida and Ernesto Soto. Jim Downing drove his Mazda RX7 solo to capture the GTU class win, just ahead of Roger Mandeville in a similar car.

Al Holbert returned to the series as a winner at Brainerd. Starting again from the pole, he easily won over Dave Cowart and Kemper Miller who drove A March 83G now fitted with a Chevrolet engine. Don Devendorf and Tony Adamowicz were back in winning form on this very fast track. They outpowered the opposition in their Datsun 280ZX Turbo. Fomfor was second on his reliable BMW M1. It was again a Mazda win in GTU, with Roger Mandeville and Amos Johnson taking their first success of the season. Jim Downing and John Maffucci took second and Joe Varde was partnered by Jack Baldwin to take third.

At Sears Point, under the sunny California weather, Al Holbert and Jim Trueman had a new success, just ahead of the two Lola T600 Chevrolet driven by John Morton-Bob Lobenberg and John Kalagian-Rex Ramsey. Don Devendorf and Tony Adamowicz outpowered the opposition in their Datsun 280ZX Tc and won over Pete Halsmer and Rick Knoop in their nifty Mazda RX7. Joe Varde and Jack Baldwin the GTU class ahead of Roger Mandeville and Amos Johnson. Jim Downing and John Maffucci finished third.

Al Holbert continued his winning streak by capturing the Portland race, with John Morton and Bob Lobenberg taking second while Don Devendorf and Tony Adamowicz powered their Datsun 280ZX to third overall for another GTO win. Diego Montoya and Fomfor were second while Wayne Baker and Jim Mullen took third. Roger Mandeville and Amos Johnson won the GTU class while Bob Bergstrom were second in a Porsche 924GTR.

Mosport was one the highlight of the season with a great fight between Al Holbert-Jim Trueman and Bob Tullius-Bill Adam who finally took the win when the March experienced trouble. Dave Cowart and Kenper Miller finished second in the Red Lobster March 83G Chevrolet. Rick Knoop and John Morton won the GTO class in the Racing Beat Mazda RX7 over the Oftedahl Pontiac Firebird driven by Craig Allen and George Schwarz. Roger Mandeville and Amos Johnson took the GTU class over Jim Downing-John Maffucci.

The Road America round featured a new contender in the name of the Ford Mustang GTP, who won the race in the hands of Klaus Ludwig and Tim Coconis, while Don Devendorf and Tony Adamowicz finished second overall in their Datsun 280ZX Tc and easily winning the GTO class! Bobby Rahal and Geoff Brabham finished third. Paul Canary and Eppie Wietzes had their finish of the season with a second place in GTO. Roger Mandeville and Amos Johnson won the GTU class, with Jim Downing and John Maffucci again second.

Pocono saw another victory for the Jaguar XJR5 driven by Bob Tullius and Doc Bundy, they were three laps ahead of the Porsche 935L driven by Sarel Van der Merwe and Gianpiero Moretti. Third place was taken by Billy Hagan and Gene Felton who earned their first GTO victory of the season. Fordmfor and Drake Olson were second in a BMW M1. Jim Downing and John Maffucci won the GTU class with the Porsche 924GTR driven by Bob Bergstrom and Tom Winters having a fine run and finishing second.

Al Holbert and Jim Trueman ended up the season in a fine way, with a victory at the Daytona Finale, in their trustful March 8G. Bob Akin and John O'steen took a well deserved second place in a new Porsche 935-84. John Kalagina and John Lloyd finished third. Fomfor took the GTO win in his fast BMW M1, John Carusso and Phil Currin ending up second in a Chevrolet Corvette. A brand new contender won the GTU class in the name of the Porsche 924GTR driven by John Schneider and Bruce Leven. Roger Mandeville and Amos Johnson were second. Deborah Gregg and Elliot Forbes Robinson were third in another Porsche 924GTR.