This one-and-only mid-engine sports racer was the D-MOD National Champion at the 1967 American Road Race of Champions at Daytona, driven by Wayne Koch. It is now restored and most notably competed in the 2017 60th Rolex Monterey Historic Reunion, Group 7a. This unique sports racer is configured as originally raced with an updated chevy II-based 4 cylinder engine mated to a Porsche 356 transaxle. Fully refreshed race engine with 60 minutes of break-in racing.
When SCCA replaced D-MOD with DSR after the 1967 season, the Koch was retired from racing after winning 7 out of 8 races through 1966 and 1967. The Koch was discovered in the early 80's at Can-Am Cars, Ltd. where it was resurrected, restored, and then raced sporting a Porsche 2.0L six engine and 901 transaxle and maintained by Black Forest Racing. In the early 90's it was sold to Waren Mosler, owner of Mosler Automotive (supercar builder), where it was restored to its unique original configuration with the Chevy II-based 4 cylinder engine and Porsche 356 swingaxle for authentic historic racing. At this time, the chassis was upgraded and set up by Consulier Engineering and raced by Chet Fillip, their head of engineering and factory driver, "I drove the car once at the West Palm Beach street race with SVRA. I started in the back and won. It was a fun car to drive. It had good brakes and I received some complaints about my 'Late Braking' ".
To regain the original weight to power ratio – with the additional weight of the upgraded chassis – the engine was upgraded to a full race GM/Mercruiser 3.0 liter inline 4 cylinder, configured with a roller camshaft, roller rockers, big-bore valves, custom J&E domed pistons, and dual 45 DCOE side-draft weber carburetors producing 231 HP at 6500 RPM and 212 FP of torque at 5000 RPM.
The current owner has owned the racer since January of 2014. Since that time the Porsche swingaxle has been upgraded to a 356C LSD along with necessary race modifications completed by 356 Enterprises. The engine has been rebuilt by Nickens Brothers Racing Engines and the car is now fully sorted resulting in a very competetive and fast car! When it runs in SVRA, it competes in the group with GT40s, Chevron B16s, Lotus 23s, Porsche 910s, Porsche Carrera 6, Porsche 908s, Elvas, Bobsys, etc. It is an eclectic, exciting group!
The current owner had the opportunity to discuss the history with the original builder and driver, Wayne (Cookie) Koch. He was a civil and aeronautical engineer, and a national model airplane winner at 12 years of age, he knew about structural integrity. To determine torsional and structural strength requirements, he designed the Koch frame out of straws – twisting and turning the model and adjusting the design as necessary. After completing the straw model, he built and welded the space frame chassis out of 1 inch mild steel tube. The body was inspired and designed based upon a 7/8-sized Chaparral and built out of aluminum panel and fiberglass utilizing molds crafted by Koch. The build process took about one year to complete. This was truly the height of the home- built era.
Designed as a mid-engine sports racer, the transmission of choice at the time, readily and economically available, was the Porsche 356 swingaxle. A balanced and blue printed four cylinder 153 c.i. Chevy II engine was selected as it was a common and successful USAC midget racing engine, which easily revved to 7000RPM. Two SU carburetors were utilized as Webers were too expensive for this one-off home built, as Koch told me,"They would about doubled what it cost me to build the car!". The custom flywheel was designed and built by Koch and mated to a clutch and pressure plate from a VW Transporter. At about 1050 pounds, the Koch Chevy Special achieved an aggressive weight to horse power ration of 5.5 to 1. It now sports a custom flywheel and clutch/pressure plate from Kennedy Engineering.
The car originally rode on Firestone tires with 7” wide 15” Triumph rims in the front and 8” wide 15” rims in the rear, which were custom fabricated by Koch out of 3 VW rims cut and welded together to achieve the desired width. After winning the Mid-West SCCA Regional Championships with Firestones, a good friend – a Goodyear dealer – insisted on outfitting the car with Goodyear race tires to attend the 1967 SCCA American Road Race Championships in Daytona.
The Koch Chevy Special was very successfully raced during the 1966 and 1967 Mid-West SCCA division in the D-Mod classification, where Wayne Koch won 7 out of the 8 races he entered. His successes won him the 1967 SCCA Mid-West Regional National Championship, which also earned him the opportunity to attend the 1967 SCCA American Road Race of Champions at Daytona, where he out- distanced the class for an impressive win.
Additional information: Rear: 10x15 aluminum rims with 245/45 Hoosier STTDS Front: 8x15 aluminum rims with 225/45 Hoosier STTDS Front: TR3 spindle and disc brakes Rear: Porsche 356 aluminum drums recently rebuilt by The Machine Shop. There are a few stress cracks in the paint and a few dents in the aluminum rockers.
Attitional: Original Trophy from 1967 ARRC at Daytona.
D-MOD National Champion at the 1967 American Road Race of Champions at Daytona. 2017 60th Rolex Monterey Historics Reunion in Group 7a Race history is known from its discovery in 1982 to present - documented by owners and in log books - as well as its racing history in 1967.
Front Suspension: Custom with TR3 spindles and brakes
Rear Suspension: Porsche 356 swingaxle
Available: 20' Wedge-nose All Aluminum Enclosed car hauler trailer
Available: Chevy II engine with Ansen crossflow head