Reply to "E85 Gas"

Depending on which configuration of the quench iron chamber heads you have, you really don't need to worry much about octane until you are over about 10.8:1 static...measured, not advertised.

In NYS we have 93 octane in the pump and Sunoco had 94 and some stations still have unleaded racing in the pump which is 102.

110-115 is for something like a 14:1 engine with a curve all in by 2000 engine rpm and 36-38 of lead.

THOSE were Pro-stock engines like Gapp & Roush and Dyno Don ran. Those were also 10,000 rpm engines...which is why they cracked the stock 4 bolt blocks.

The fact of the matter is that it is probably wiser to pull the engine apart enough in order to lower the c/r to a max of about 10.5 and just run pump gas.

You will find that you only need 36 total degrees advance if using the factory iron closed chamber heads with some kind of a pop up piston.

The newer aluminum heads you can probably run down to 32 degrees and not loose power. The plus being, the two things that require more octane are the rate of ignition advance (and total) and static compression ratio.

Deal with those two and the racing gas monkey is off of your back.

You just don't need it any more.