C12 vs pump gas

[Dan Fahey]

Originally Posted by dartman

I have a low compression 340 combo,and when I put c12 or blue in it, it's starts to skip at high rpm in high gear (5800 to 7000 rpm) but with high octane pump gas it runs clean.any help would be great.

There are several schools of thought on this

What I was told years ago was that the Racing Fuels were a lower density than Pump Gas.
AND It Burns Slower than lower Octanes.

Back in 90's, the racers that ran low compression rides like 455 Firebirds, 6 Cylinder Maverick, Pintos told me to get the racing gas to work they did two things.

Leaned out the Carb and bumped total Timing to 50 degrees.
This seem counter intuitive to me but watched them set records.

Not sure, think they had to use a cooler Plug too.

Not what you want to do for the street or road racing but worked for short duration sprints for drag racing.