The 1951 Ferrari roster was Villoresi, Ascari, Tarufi & Serafini, one had an accident on the Mille Miglia race, so Jose Froilan Gonzalez was called as replacement, and he raced 1951 silverstone Grand Prix without a contract. after the victory, he got the same contract that VilIoresi and Ascari had.
besides winning 1951 on silverstone, he was also the first one to surpas 100,65 mph
back then ferrari used 2 tyres suppliers, Pirelli (b/c nationalistic reasons) and Englebert, for silverstone he used Englebert on that first ever victory (acording to a Jose Froilan Gonzalez interview for the argentinian racing magazine "Corsa" Number 581, july of 1977
that is a great interview i took some data from.
https://www.f1-web.com.ar/pilotos/jose-froilan-gonzalez.htm )
The car was the Ferrari 375 F1 4500 cm3 V12 (4493 cm³)
3rd image has the track and the numbers, those are the location where he switched to that transmition speed/gear, and bellow is my translation of the text:
"J.F. Gonzalez: How i raced at silverstone…."
Copse { "here we turn in second gear about 7200/7300 rpm that was like 110/120 km/h"}
Stows { "this was the fastest place on the circuit, at the end of the straight we reached 212/215 km/h that on 5th gear were about 7500 rpm"}
abbey { "At this turn was the timing, we came on 4th gear and when starting to turn we switched to 5th gear"(sic)}
woodcote {"Woodcote was the most demanding turn and even if the racetrack was wide, it was dificult to take."}
