I've had a few 253 V8's in 1970's era GM Holdens. A small but powerful motor that didn't chew much more juice than the average Straight 6 (202 and 186) of the time.
The Shocking Truth Behind Holden's Banned 253 V8 Engine!
Video from https://www.youtube.com/@EpicMotors1
The Shocking Truth Behind Holden's Banned 253 V8 Engine!
Video from https://www.youtube.com/@EpicMotors1