I'm having an issue trying to work out the heater connections from my CA18 to the original Datto 1200 heater core.

The only half decent picture of the CA18 cooling system I found was on the NICOclub.com Forum and whilst it helped me a little (I think I may be missing a hard line at the rear of the block) it has not resolved anything for me.

At the moment I have two pipes that are about 16mm diameter that have nothing connected to them.
One is a long pipe that runs under the intake manifold toward the firewall.
The second comes out of the rear of the block (just above the gearbox bellhousing) and point toward the drivers side strut tower.

Originally I assumed these two pipes just needed to be hooked up to my heater core. However I am now thinking they are designed to carry the main water flow through the system and I need to be connecting into a smaller bypass type connection.

If anyone has any photos of the rear of their CA showing the connections or can offer any advise it would be greatefully accepted.