My opinion in the past has been pretty solidly in the camp that the aftermarket return regulated fuel system (from the fuel plugs in the back of the heads) is not needed in the least - not for stock or even moderately tuned engines. The aftermarket systems are added complexity that have caused some people problems. The stock design is a return regulated system, it just happens before the heads instead of after. The fuel path in the heads is large enough that there is VERY little pressure drop in them when fuel flows to the back cylinders.
After talking with a friend about it, we started discussing how to cool the heads better. The return regulated topic came back up. Interesting thought - increasing the cooling of the heads with this RR fuel system. I still like the idea of drilling and tapping the back of the heads for installing coolant return lines (larger fluid flow rate), but the fuel would be at a lower inlet temperature and help some. Could be that the cooling aspect of a RR system is worth considering. Too lazy to make any attempt at calculations, just thinking out loud.
After talking with a friend about it, we started discussing how to cool the heads better. The return regulated topic came back up. Interesting thought - increasing the cooling of the heads with this RR fuel system. I still like the idea of drilling and tapping the back of the heads for installing coolant return lines (larger fluid flow rate), but the fuel would be at a lower inlet temperature and help some. Could be that the cooling aspect of a RR system is worth considering. Too lazy to make any attempt at calculations, just thinking out loud.
