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Water neck I.D


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Definitely not L16/18.

 

Probably a Z20/22/24 ... The L series tend to be smaller for the heater return line...

 

L20BandZ22waterinlet001Large.jpg

 

Z series are larger...

 

L20BandZ22waterinlet002Large.jpg

 

 

If you show the top of the timing cover you can tell if L or Z series. The reason for the larger pipe? Well the heater return joins up to coolant lines that run up all four intake runners and then that larger hose joins to this inlet.

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