Now $60, down $40 off its usual $100 sticker price, this miniature engine ... of a V8 or inline-six configuration—with a big, exciting project in a small package before the sale ends.

Gasoline is routed from a jar on the work bench. The mini V8 sits on a platform while the engine builder opens the throttle via a tiny wheel next to the air scoop. The sound it makes is nice and ...