LS cylinder heads are machined with metric M12-1.5 coolant sensor ports,This adapter allows you to keep your original sensors and integrate them into your swapped LS engine. I would suggest measuring the length of your sensor before purchasing this adapter.
Adapter has a female 3/8" NPT port, 1.7" deep. Work great to run a aftermarket temp sensor,Work perfectly with your auto meter temp gauge.Works perfect with manual temp Guage sending units with long probe. M12-1.5 screws right into any LS cylinder head.
You can do an LS swap and the electric relay fan kit which come with a larger and longer sensor than usual.
Larlansz Precision threads never leaked or stripped any threads when installing.This adapter will fit all GM LS series engines.
Fits in the side of head to install temp probe. Thread size and pitch is correct for factory ls style heads. Then just screw sender in and done.
Install water temp sender in head.
Work perfectly with your auto meter temp gauge.