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I used to run a 66 mustang strip car on the street with a worked over 289 (11.5~1 CR) I found a place in Utah that sold concrete sealers and octane booster(strange product mix). Their product used real tetraethyl lead and you could buy a case (12 bottles) for about 125$. I forget the name of the company but each bottle could treat a tankful with an increase of 8 full octane points, not the garbage you can but elewhere that only increase octane a half to a full point. Should be able to find it thru internet searches though. Worked great. Brian
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