LEGO part 61069 - Light Bluish Gray Technic, Panel Engine Block Half / Side Intake at BrickScout
Engine Cylinder Building Blocks | Lego Technic V8 Engine Kit | Technical Parts Kit - Blocks - Aliexpress
Amazon.com: Yanscian 6 Cylinder L6 Engine Model Building kit Set Hobby DIY STEM Toy for Kids & Adults with Guide 500+ Pieces, Toy Building Set, Build Your own Engine That Runs, Mini
LEGO part 4616b - Blue Fabuland Airplane Motor / Engine Block, Technic Pin (3673) Hole - Set 6345 at BrickScout
LEGO Technic V8 Engine Motor crankshaft piston cylinder block V 8 BRAND NEW | eBay
High-TEch Super Horizontally Opposed V-8 Cylinder Engine Electric Model Technology Machinery Assembled MOC Building Block Toys
Amazon.com: Domani Technic Spare Parts Crankshaft Engine Connecting Rod Engine Cylinder Head Bricks Sets Compatible with Lego Technic Parts - 67 Pieces : Toys & Games
Barman's V-8 Engine Building Instructions/ 2,862 Parts - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums