Displacements from smallest to largest I’ve owned:
GM: 2.2, 2.4, 4.3, 4.8, 5.3, 5.7, 7.4 (current)
Ford: 2.3, 5.8, 7.3 (current idi diesel)
Toyota: 2.5 (current)
Subaru: 2.0 (current)
Briggs and Stratton 620cc
STIHL 25cc
Iirc the largest production engine I’ve ever laid my own two eyes on...