Foyt as well as Andretti and a few others ran the DOHC in sprint cars.
Not a sprint car, but Foyt's full-sized USAC Championhip Dirt Car (Indy legal car, but designed for running dirt. No USAC sprint cars that I ever heard of ran the 4-cam Ford back then, given that USAC's engine formula specified just 220cid for an overhead cam racing engine. Parnelli Jones also ran a USAC Dirt Champ car powered by the 4-cam Ford V8.
This chassis has a USAC Champ Car required 96" wheelbase, where a USAC (and in the era of this car, USAC was the dominant Sprint Car sanctioning body, being the only truly nationwide series in those days) Sprint Car used an 84" (seven feet) wheelbase (to put this in perspective, the Kurtis Midget as released by Revell, was built on a 72" --six feet-- wheelbase in those years).
This particular car was an AJ Watson design, with other similar cars, also powered by Ford being driven by Parnelli Jones, Mario Andretti and several others. By the 1960's, USAC's dirt tracks were fewer and fewer, people seemed to want (as did a lot of car owners) more races on paved ovals, and most of the formerly dirt mile oval tracks on USAC's circuit got paved over. By the late 1960's, only the Indiana State Fairgrounds track, and similar mile tracks at DuQuoin and Springfield IL remained on the circuit--in fact, this very car, in Sheraton-Thompson colors and Offenhauser power, won the 1965 Duquoin 100 miler, then due to a road accident that prevented Foyt's then-new Lotus Ford from arriving in Milwaukee for the Labor Day 100 miler, got set up with pavement tires, went out, won the pole, and lead virtually the entire race until a rear tire blistered, requiring a last minute pit stop. The Ford 4cam was installed I believe, in 1968.
Edited by Art Anderson, 14 February 2012 - 02:50 PM.