OK, I have a 350 with unknown guts, Edlebrock 650 CFM 4-barrel carb, Edlebrock Performer intake manifold with headers. The engine was built by a shop in Missouri (data plate on block with only serial number) and it kicks #ss when its running right.

My problem is detonation (knocks) when accelerating. Spoke with my mechanic about this and he recommended a fuel additive that he is super-pumped about (and a dealer for).

The cider is called DLEF All-Purpose Fuel Treatment and is produced by David Liles, Liles Oil Company Inc. It is listed as a "Cetane & Octane Booster" and has ethanol in it.

I tried it, bam! no knocks!!! Seems to work great!

So what is the problem? I've moved away from my mechanic and this stuff isn't the easiest to find where I live now.

I always fill with premium (93) and add 16 oz to a 17 gallon tank. It seems obvious to me that the extra octane is what is getting rid of the knocks but maybe there are other ways to get the knocks out and enhance performance???

I now use this car as my primary rig and don't like the knocks!

Anyone have any good ideas/opinions/facts about these "snake oil" products?