512 B1 heads HP?

A Friend's 500 Iron Indy headed little motor makes 800HP on c16. I was warned to keep this engine off the Alcohol, or it would rip the main webs out and be gone, in short order. The Indy motor has been running 1/8 miles for 4 seasons now and we have been careful with the tune.
Another Bud built a very similar B-1 headed 500 on E85 and threw it in the trash the 1st time he run it all out. The main webs give up and it was history.