Discovery Model Engine Building Kit, DIY 4-Cylinder Combustion Engine, Working Pistons Fan Valves Belts LED Lights, STEM Mechanic Engineering

Smithsonian Motor-Works Model Engine, Multicolor

Helixsun L4 Engine Model Kit That Works, 1/10 DIY Mini OHV Four-Cylinder Diesel Engine Model Kit With Cooling Syste, Full Metal Inline Mechanical

Revell 85-8883 Visible V8 Engine Model Kit 1:4 Scale 314-Piece Skill Level 5 Plastic Model Building Kit

Revell 85-8883 Visible V8 Engine Model Kit 1:4 Scale 314-Piece Skill Level 5 Plastic Model Building Kit

Stemnex V-8 Engine Model Kit

Revell 85-8883 Visible V8 Engine Model Kit 1:4 Scale 314-Piece Skill Level 5 Plastic Model Building Kit

DM116, 5 Cylinder Radial DIY Engine Model Kit That Runs, 1: 6 Full Metal, 250+Pcs, Gifts For Him

Discovery Mindblown Model Engine Kit, With Moving Parts And Lights

Toys AND Games Playz Flat 6 Model Engine Building Kit - 320+ Pieces Revved-Up Internal V8 Style Combustion To Build Your Own Mini Engine That Works - DIY STEM Project Gift For Kids, Teens, Hobby Kit For Adults

ENGINEDIY Jet Aircraft Turbojet Engine Model 3D Printing DIY Functional WP-85 Turbojet Engine Model That Works - 100 Pieces(3D Printing DIY Functional Aircraft Turboprop Engine)

Franzis Porsche 911 Boxer Engine Model Kit - Porsche Museum Edition

DM115, OHV Inline 4 Cylinder Diesel DIY Engine Model Kit That Runs, 1: 10 Full Metal, 300+Pcs, Gifts For Him