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Message: HTML is not enabled. UBB Code™ is enabled.	[QUOTE]Originally posted by TheMoMan: [QB] ____ The starters for the big iron were impressive also. Octane/CR on large engines, these engines were not over square, the strokes were longer than the bore diameter. So they were limited in how high they could rev. Take one up to Fomula one revs bring it home in a basket, use it where it was designed to operate. Sub 4500 RPM. The big Pontiac V8s made max torque at 1800RPM Max HP at double that. Mine very seldom saw 5000RPM. Because of the low revs and long intake cycles inductive supercharging worked, with the right valve timing. So a 12.5CR at 4000RPM was effective of 16/1 because of the enertia of the incoming air, these engines could inhale way more than they displaced. To get the most thermally energy out of the fuel air charge high octane was needed to stop knock, but then the advance curve needed to be huge to light the fire soon enough at full bore. On the Chevy wedges 45 to 50 degrees on the Pontiacs you didn't want to go over 38 degrees total vac and Mech. ____ Use those numbers on an over square engine and you are asking for trouble. Where I worked one of the engineers in the dyno-labs discribed it as the piston feeds the fuel into the fire, then as the gasses expand the power stroke begins. ____ Suck, Squeeze, Bang, Blow. ____ Those big Irons could run on todays fuel but after you detuned them for the crummby fuel there isn't any power left. You might as well as pour Coleman stove gas in the tank. [/QB][/QUOTE]