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Originally Posted by CJM

torco is the only octane boost that actually works.

I ran as well as my buddies 92 octane in our 400s for years, never an issue.

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Ya Torco is what I got, good stuff.

There's plenty of other good ones as well, Torco isn't the only one but torco is among 3 or 4 quality octane boosters that actually work. One of them being toluene and xylene as well as the lucas oil racing octane boost. maxima high test is also another good one. 1 oz. of the high test will raise 1 gallon by 4 pts.

Anything you see in walmart will generally be junk, but any of the proven race names will increase octane just pay attention to the product and what it actually claims. Blendzall also makes a good one.