Inliners International Forums General Discussion Hi Performance Performance Enhancements for a Chevy 250

But if I boost the octane enough using denatured alcohol then shouldn't it prevent it from knocking? My dad used to use denatured alcohol all the time when he raced his friends in his 69 GS 400. He said he would go the pharmacy and buy a pint of denatured alcohol and add it to a quarter tank to drag race. He said it made all the difference.