Screaming Saturday - skip this post if you’re not interested in engines!
Ginger Marshall (half of Marshall and Fraser) wanted a small capacity race engine that produced some good power output. He started by using a 970cc Cooper S unit but he preferred the aluminium Coventry Climax based overhead cam Hillman Imp engines and started by engineering one to fit a mini gearbox (no small feat - as the Imp engine is longer!)
Step by step Marshall and Fraser developed the unit until it was their own. With a steel crank and virtually everything their own design. The BHP was dramatically improved and it revved to 9,500 rpm! And just to add to the engineering excellence, they made the engine dry sumped!
Not my photo and I don’t know who took it. I’m not sure what car it’s fitted in, but it’s either their lightweight Mini Traveller or the Reliant Kitten.