82-86 RWC Merc 260 SBC thermostat question

SR360aft

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exMember
Joined
Nov 12, 2005
RO Number
19538
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170
I was replacing the thermostats on my 86 Mercruiser sbc 350/260hp's. The “sleeve" pictured below was missing. What does it do and what could happen if it's missing?
Thanks

5029398_3_49800.JPG
 
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