Lake Underwood began
sports car racing in
MGs initially, but soon was piloting a vehicle powered by a
Porsche 356 engine loaned to him by the inventor,
Ben Shereshaw, who owned a 1952
Porsche Supercar. Porsche factory
disk brakes—not used on
production vehicles at the time—were adapted for the vehicle by
Dick DeBiasse, (the founder of AER Research in
Madison, New Jersey) who was able to reduce the weight of the parts without altering their effectiveness, giving the vehicle a distinct competitive advantage. Before long, managers at
Porsche recognized that racing in American circuits could increase sales. They chose Underwood and his team to become the recipients of engineering tips from the factory as well as factory equipment. Underwood became a founding member of the Northern New Jersey Region chapter of the Porsche Club of America, serving as its second president. By nomination in 1957, he is among the few ever invited to join the
Road Racing Drivers Club, serving as its president as well. He maintained friendships with others driving both motorcycles and Porsches, such as
Mark Donohue,
George Mennen, and
Stirling Moss. He won two
F-Production National Championships in 1956 and 1957 with one of the "bathtub" Porsches. Driving a Lister Jaguar, he finished sixth in his class at the 1959
12 Hours of Sebring. After switching to a larger engine in his Porsche in 1963, Underwood won his third F-Production National Championship. Lake Underwood raced in
Class F (
F-Production or FP), in
SCCA, factory
Jaguars,
Jaguar D-Types, and
Costin Lister Jaguars for
Briggs Swift Cunningham II,
Porsche 356s,
Porsche 550 spyders, and on the Cunningham Team in
Porsche 904s and
Porsche 906s. At 12 Hours of Sebring in 1964,
Briggs Cunningham and Lake Underwood drove their jointly owned silver
Porsche 904 GTS,
Number 37, to capture first place in
under-2-liter (prototype class) and ninth overall for the race car—during its debut racing season—good photographs of the automobile taken by
Bill Kutz are accessible via the external link provided below to the Internet site of racingsportscars.com, which has posted many historic photographs of the automobiles that participated in that event and data of interest to enthusiasts. In 1965 Lake Underwood raced in 12 Hours of Sebring for the Porsche factory. Co-driver,
Günter Klass, and Underwood drove a
904 GT in the race and they won first in
under-2-liter GT class, fifth overall, and first overall in the prestigious
Index of Performance. He was following
Don Wester when Don's automobile struck
Mario Andretti's at
Sebring in 1966 and Underwood had to drive blindly through the tragic accident scene where four spectators were killed after they entered a prohibited area and were struck by Wester's vehicle that Underwood estimated was going at the time. Driving a
Porsche 906 with
Ed Hugus, Underwood's final Sebring race garnered fourth place in the Sport Prototype class. Vehicles Underwood raced are treasured in collections of historic automobiles such as those assembled by collectors such as Collier and Cunningham. They appear in public displays, automobile shows, and among rare and vintage showcases open by invitation. == Other sports and activities==