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I am running the 1 1/8". Not really sure if you'd be able to tell a difference with the 1". In either case, a new front sway well help eliminate body roll and also stiffen up the front a bit.
I got a big block engine on my 67 and wonder if a 1" fitts. I have a standar sway bar today, and i got almost no space between my oil filter and swaybar. I know there is bigblock 1" swaybars on the marked, does anyone know what the differense is between a standar 1" and a 1" for bigblock?