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what is the difference between turbo and na cams by looking at it??? how can i tell? i odered a na head with cams. how can i tell the difference?

first of all i have stock tt wheels (in the rear i currently have 275 40 17 old tread design KDW) i really want the bfgoodrich KDW-2 (new tread design) but they only have them in 255 40 17. should i go down in size and get the 255 or stick with the old design and get the 275's? the new...