The MG PA and MG PB
Despite some MG's being capable of revving out to over 8000 rpm, the engines had all only used two main bearings.
Progress appeared in mid 1934 in the form of the MG PA, which featured three mains and continued the shaft-driven single overhead cam layout and standard Midget displacement of 847cc. With its sweeping clam-shell fenders the PA was truly a tiny TC, stretching 15 cm less between hubs than the latter.
This was still a few centimetres more than the JTypes though, and the purists were disappointed when the PA was weighed in at 1650 pounds, some 44 kilograms more than its predecessor. To many (2000 eventual buyers) this was a better-than-even exchange for a cockpit free from flying gravel and clumps of turf.
For roughly the last half year before the overhead-cam MG's were discontinued in mid 1936, a PB model was available just like th PA, except for a bigger bore and a 939cc capacity. This really did justice to the car and made it one of the most fondly remembered small sports machines ever assembled, and explains why they are so highly prized by collectors today.
Also see:
MG Heritage
MG
Performance Chart 
