I still think head temp is not an issue to be concerned about for the builds that we see posted on this forum. I watch oil temp and if it is kept reasonable, no issues.

However, I would add this to the discussion. The oil flowing through the rocker boxes drips through; pull the rocker boxes and fire up the engine and see. It's not like the oil squirting from the pushrods of small block Chevy. In other words, the volume isn't high enough, IMHO, to have any cooling effect on head temp. Furthermore, if the oil does have a cooling effect on the head temp, doesn't it make sense to keep the oil as cool possible?

The function of the piston rings has also been overlooked in this discussion and most of the engine heat comes from the ring function. Aside from sealing the cylnder, another primary function is the transfer of heat from the piston to the cylinder and the cylinder fins catch wind and dissipate the heat; the cylinder is the heat sink. The cylinder transfers the heat to the heads, so the bigger the bore, the faster the piston speed, fuel octane and compression all contribute to head temps.

Most everyone runs the highest premium fuel available but if the engine runs fine on the next lower grade, no detonation, the engine will run cooler on the lower grade than it will on the higher grade.

So, if one is concerned about reducing engine heat, as Chop suggests, tune out the factory 14.7 AFR to a more reasonable level, add an oil cooler and run the lowest grade fuel that will not ping. JMHO.