E10 gasoline in our old school engines.

[Slammed84]

I know this isnt the best forum to raise this question but wanted to get opinions from you guys. In Oklahoma the majority of reputable gas stations onlyoffer E10 gasoline. You can find 87 octane 100% real gas at QuikTrip, which is the biggest seller of gas in Tulsa, and have stores in other cities in other neighboring states.

I don't think twice about filling up in my Vortec powered 97 shortwide, and wont think twice to run it in the bone stock goodwrench 350 i have in my 84'.

But questions arise when it comes to higher performance engines. Im slowly putting a 498 BBC together, and while i am planning to keep it a mild build, i do want to run somewhere around 9.5:1 compression.

I know there are other factors besides compression ratios. But on an all iron, old school BBC, im wondering if it will be okay to run the 91 octane E10.

If there are any big block guys I would love to hear thoughts and opinions on this subject.