Just to add to the disscussion.
...and those holes that is drilled in the "848" head should be drilled at an angle so that the holes are "SURE" to be fully into the water jacket to be fully effective. I had mine drilled at my local machine shop and if I remember correctly it was at a 12 degree angle.
.....as for the 1/2" oil ports I will be running a filter between those ports.
