The monocoque BRM P261 V8 car was soon developed and these ran on through the 1.5-litre formula and performed useful service in the early races of the subsequent 3.0-litre formula. In 1965 Jackie Stewart was signed to partner Hill; he took his first grand prix win at Monza in his debut season, and won the first world championship race of the new three-litre formula with a car fitted with a "Tasman" two-litre V8; once again BRM were not ready for the start of a new formula and the old cars continued to be used, even on occasion after the H16 was ready.