Got my K20a motor does anyone know what is that rear of block hole that goes there? came like that missing nothing looks like for a sensor or some kinda plug pipe? back block near engine oil cooler part. posted a photo
The coolant hose just to the left of that hole normally goes there. There is a section of metal pipe that bolts to it then the hose connects to it. The hole where your hose is currently is then blocked with a cap.
Some blocks (K24a1/a4/probably others) don't have that hole for the coolant line. Adapters are available (like the one you have) to still allow an oil cooler to be installed.
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