That's a "given". We had to also consider collection of oil on right side of engine. 3/8 mile ovals are pretty tight at 80 mph. Our Dyno and dirt track engine results prompted Amsoil to offer lower viscosity racing oil. When we first tested, we brought dyno results from the very first Wissota 400 hp Street Stock GM, to Amsoil with their 20/50, vs. Gibbs 10/30. The numbers convinced them to create a low viscosity racing oil. The MOTOR COULD NOT CREATE 400 HP with the 20/50, but the Gibbs produced 402 h.p. Best we could pull on the 20/50 was 396 h.p. Racers had been "watering down"....so to speak, the 20/50 with 10/30 regular synthetic Amsoil, because they were getting free Amsoil as sponsorship. We used Line Automotive (Lance) in Wright MN., Dad and brother to the drag racer Line. Amsoil had already been working on a low viscosity race oil, but they came out quicker once they saw the results we produced, as well as loosing business to Gibbs....a very fine product as well. Our Super Stock Wissota uses only a Holley 500, with stock GM intake. Compression ratio is unlimited and we achieved 14:1 by angle milling 2.02 camelbacks. In 2009 or so, a certain aftermarket head was allowed because the ole camelbacks really became a precious commodity. The aftermarket heads created an easy 390 hp, but never eclipsed 400 on either torque or horsepower. My brother lost the shop to the bank, but only because he kept borrowing money on the shop to finance his failing mortgage business. I got nothing out of the deal but grief and experience. Burned up almost all my 350 Chev cores and all but a handful of camelbacks. I'm probably talking "Greek" here to anyone under 50 years old, eh?