PatBuckley Pat how can you say the cosworth-ford motor is the same as an FE
Not even close. About the only thing they have in common is sucking air and fuel, and spinning round. Rpm ranges double to triple of an FE. Assembly wieght of crank,rods and pistons, 1/2 to 1/4 of an FE assembly. The only thing that should break in the FE oiling system is the sheer pin in the distributor gear and shaft. The shaft may twist and break but I only saw this on oem shafts. How many races did your cosworth motor run before a rebuild or tear down? 1 if you are smart. With the price of parts for that motor, 1 race ,1 rebuild. Was is the clearances on the rods and mains for your motor.0035-.004" mains and .0027-.0035? Great for a race motor, this motor would drop dead on the street. I think you know this. If you are running an Aluminium block like a shelby with steel caps for the mains, I am around .002" or less without any problems at this time, rods are also in the .002"-.0022". There is 2 different worlds between racing and street driving with looking for 100K on a street motor.
On most motors, Chevys, the 10 per 1000 is ok, IMO this doesn't apply to a small bearing heavy rod FE motor. Rick L.