The fittings for the oil return lines have o-rings inserted in a groove within the fittings. The o-rings are hard
to see without a light, but they can be removed with a scribe or pointed tool, and replaced using a small pair of needle nosed
pliers. I replaced these rings to help prevent later oil leaks at these fittings. These o-rings should be liberally
oiled to let the oil lines slip into them without distorting or tearing them.
Here is the front oil return line. The front line is a metal tube. In order to install (and remove) the head,
there is a nut at the base of the V of the cylinders that needs to be removed. Once this is unbolted, the tube can be
eased slightly out to the side of the engine to let the tube be flexed as it is inserted or removed from the head.
The rear return oil line is a little easier to work with. It is rubber and can be flexed. While it still
needs to be inserted before the head is lowered into place, it can be a little easier to align. Obviously, the hose
end and fitting need to be oiled to let it insert easily.
Once the return oil lines are inserted into the heads and the heads positioned, one can move on to torquing down the
The feed lines for the cooling oil to the heads enters each head just in front of the throttle body flanges. The oil feed lines are connected after the heads are torqued down and the intake manifold is installed.
With the heads torqued down, it can be easier to install the throttle body before installing the rockers
arms. The extra clearance is pretty nice to have.