Can anyone tell me what LEGO piece this is?
2 Answers
Technic, Engine Cylinder with Side Slots
https://www.bricklink.com/v2/catalog/catalogitem.page?P=2850
This one is used to build engines, used in V or I engines like this: link
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1There's a flat configuration too. Look at the engine of this one: lego.com/en-us/product/porsche-911-rsr-42096 Nov 5, 2020 at 16:23