Bizzarrini P538 drivers Edgar Berney and Andre Wicky, but records indicate both retired after three hours with a cooling problem. A second team in a production-based Bizzarrini A3/C, driven by Sam Posey and Massimo Natili, was disqualified after a pit lane violation, possibly while returning with serious frame damage. American Ferrari driver Mike Gammino then commissioned a Lamborghini 4.0-liter V12 powered car, which he raced once. Bizzarrini attempted to build a second, 3.5-litre V12 car for Le Mans, but was unable to complete it before bankruptcy. Beginning in the mid-1970s and continuing at least through the 1990s, former Bizzarrini engineer Salvatore Diomante
Lamborghini Miura steel chassis components and body panels with the lightweight aluminium alloy Avional and replacing side windows with plastic, with the resulting car weighing approximately 800 pounds less than a production Miura. A front spoiler was added and the headlights were replaced with fixed, faired-in units. Wallace substituted two smaller, sill-mounted fuel tanks for the single larger original unit. The suspension was reworked and widened (9" in the front, 12" in the rear), and lightweight wheels were fitted. The engine was modified to produce 418–440 bhp at 8800 rpm, with an increased compression ratio, altered cams, electronic ignition, dry-sump lubrication and