First used in a handful of European Hill Climb events in 1966, the Porsche 910 was a development of the 906 introduced earlier that year. The major change was a switch to cast magnesium centre-lock wheels (as used in F1), aimed at improving the speed of pitstops in endurance races. Usually equipped with a 200bhp version of Porsche’s 2-litre flat six, the 910 was also fitted – on rare occasions – with a 270hp, 2.2-litre flat eight. Raced exclusively with a flat six, chassis 910-005 was run by the factory in the 1967 12 Hours of Sebring. Driven by Gerhard Mitter and Scooter Patrick, the car would start down in 11th, outgunned in qualifying by the big V8 machinery from Ford and Chaparral. However, aided by its impressive reliability, 910-005 would rise through the ranks during the race, eventually crossing the line in third overall (winning the 2-litre class comprehensively in the process).