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Restrictor in passenger coolant hose?

lx347cd

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So Im doing my Whipple install and there is a restrictor pipe inside the passenger side hose area that needs to be reused?
I show a picture here. Anyone know what the purpose is for? Im assuming to restrict flow for some reason? Just curious because the driver side does not have it- just passenger.
coolant hose.jpg
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88lx50

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It's usually there to restrict flow to the heater core. Probably so it doesn't get blown out by added flow/pressure.
 

Cobra Jet

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It's usually there to restrict flow to the heater core. Probably so it doesn't get blown out by added flow/pressure.
^^^ 100% correct.

These were also common in the 1986-1995 5.0’s. In those models, the restrictor fitting was made of steel; it was only found in 1 hose located at the firewall which went into the heater core. The problem is, if someone didn’t know about that tidbit of tech info and replaced/discarded the stock heater hose, the restrictor was gone... new 86-95 5.0 heater hoses didn’t come with the restrictor.

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Good find and hopefully your post helps other S550 owners in the future.
 

Lime1GT

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I would say it's there to slow the flow down so the core absorbs more heat from the coolant to be more efficient.
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