this is how much a single decision changes things, from never qualifying, to competing with the best, in one design change, from one decision, from Brian Hart in 1983 F1 racing engine design

 Then I decided to cast the head and block as one and we gained 130bhp. 

What's the history of the guy who made that choice? Well, he specialized in airframes during his early training at de Havilland, went racing in F2 in the late 50's, then worked at Cosworth through the 60's after spending so much time there buying parts, then went solo on his own engine company, encouraged by no less than John Surtees, he drew up a new 2-litre F2 engine to get away from improving other companies (Cosworth and Ford) engines - and making his own

https://www.motorsportmagazine.com/archive/article/may-2004/72/hart-of-the-machine