So I just swapped in a b18c1 into my originally ls integra. I just have a couple things left to do, one of those being there is a coolant outlet or inlet on the back of the block right above the oil filter and I have no idea where it goes or what the hose would be called. The other thing is I bought a vtec subharness but I don’t know how to do the pinout. And before you guys say, ”did you read the other threads?” Yes I did. They talked about where the pins go but in my case where the solenoid and pressure switch pin into the ecu, the spots are taken. Do I just solder the new wires to the old ones? Or pull them out completely. Thanks guys

 

As far as the coolant lines go, the one you're talking about runs to the idle air control valve (IACV). If you're not familiar with the layout of coolant and vacuum lines, Honda's parts diagrams help out a lot. You can find them on any OEM parts distributor website like oemacuraparts.com

 

Some cars were pre-wired for vtec up to the shock tower connectors, see the image below;

Integras should be the same, if you have the vtec wires coming from the body you can pin into just the engine harness side!