Power and potential according to displacement and in general is the name of the game!
Ps. We all love pictures.
My contribusion to this thread will be the largely unknown (internationally, at least performance wise) Volvo Red Block platform.
The B2x (Red Block) platform was standardised in a lot of Volvo's in 1976 and was in production until 1998 so it has been on the market for a shitload of years. This engine platform was the base design of a 2.0l 8v , a 2.1l 8v NA and Turbocharged model, 2.3l NA 8v, 16v and Turbocharged model.
The real magic of this engine is the amount of configurations it came in and the bore and stroke potential it has. In fact, you can bore and stroke the standard B23 (2.3l) engine block to a full 3.0 litres!! If you could get a hold of a limited number EVO engine block (Based on a Volvo Penta design and externally identical to the standard B23) you can bore it even more, which can give you a maximum displacement of around 3.2 litres!
the engine block itself can be compared to the BMW 2.3l 16V of the E30 M3 or the 2.3l, 2.5l Mercedes 190E 16V in size so it fits in almost any FR configuration (Hell, I even know of guys that has put these in early Toyota Starlets and in the rear of VW Beetles!).
As you know the E30 and the 190E ran in DTM with respectively 320HP (BMW)and 375HP (190E 2.5l 16v AMG). Now imagine if those engines could be stretched to 3.2 litres?! Well, this is what the Volvo Red Block can do! In a High - End 16 valve naturally aspirated configuration the Volvo Red Block Engine is capable of producing over 400HP with less revs per minute and more torque than any of the BMW/MB alerternatives, and that is just astonishing!
Imagine a 3.2 litre, 4 cylinder, naturally aspirated engine with around 400 horsepower mounted in a Honda S2000 or a Toyota AE86