on the B1 motor I built and dyno tested last year with two #8 return lines per head I had one pull that got extended do to operator error and we ended up filling the valve covers with oil enough to make it leak out the breathers with a 10 quart oil pan I used 90 degree elbows on the hoses to clear everything instead of 90 sweep ends The next B1 motor will have sweep ends instead of elbows