Oh man! Just trying to get Doug the info he needs. Thought he should try a little higher octane fuel before he messes with that professionally tuned distributor. The clue I had right off the bat was that he was comparing his 10-1 engine with a post about a 9.5 to 1 engine that was specifically built to run on 93. I remember Doug's build from posts years ago. The curse of a good memory! When I asked the question about fuel and compression I was trying to get the rest of the 'guessers' up to speed on the engine first. There's a big difference right in that area of compression. Especially with cast iron heads. Racing fuel may be expensive but the point has often been made that you can buy a lot of racing fuel for what aluminum heads cost. Some of us like to stay original and for us there isn't any choice but to pony up for fuel. I also know Doug likes to race his car at the track and if you 'de-tune' the distributor it will be slower. The distributor was built to use a 'power band' in those RPM's where he has spark knock. I bet if he adds octane he will not have to touch a thing and he will be much faster for it. His choices are to de-tune for low octane or buy higher octane and race. The only other choice is to yank it and build it for 93.
