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New to the 1UZ

Supersport650

New Member
Hi guys, new to the forum and new to the 1uz. I picked up a mk3 shell and I’m planning on putting a 1uz in it that I picked up from a pick and pull. I’m in the process of tearing it down and inspecting it but I have a question a about a part on the block and I’m having trouble finding anything about it. What is this?
Thanks for your help.
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