▁unknown ▁structure <0x0A> </s> ▁The ▁ 1 9 6 9 ▁Vol unte er ▁ 5 0 0 ▁was ▁a ▁NAS C AR ▁Grand ▁National ▁Series ▁event ▁that ▁was ▁held ▁on ▁July ▁ 2 0 , ▁ 1 9 6 9 , ▁at ▁Br istol ▁International ▁Speed way ▁in ▁Br istol , ▁Tennessee ; ▁which ▁was ▁re built ▁with ▁more ▁bank ing ▁for ▁this ▁race . ▁ ▁The ▁transition ▁to ▁purpose - built ▁race c ars ▁began ▁in ▁the ▁early ▁ 1 9 6 0 s ▁and ▁occurred ▁gradually ▁over ▁that ▁de cade . ▁ ▁Ch anges ▁made ▁to ▁the ▁sport ▁by ▁the ▁late ▁ 1 9 6 0 s ▁brought ▁an ▁end ▁to ▁the ▁" str ict ly ▁stock " ▁vehicles ▁of ▁the ▁ 1 9 5 0 s . ▁ ▁Race ▁report ▁It ▁took ▁three ▁hours , ▁eight ▁minutes , ▁and ▁seven ▁seconds ▁for ▁the ▁event ▁to ▁reach ▁its ▁conclusion . ▁David ▁Pear son ▁defeated ▁Bobby ▁Isaac ▁by ▁more ▁than ▁three ▁la ps ▁in ▁front ▁of ▁an ▁audience ▁of ▁thirty - two ▁thousand ▁people . ▁Roy ▁T yn er ▁finished ▁ 9 7 ▁la ps ▁down ▁and ▁still ▁recorded ▁his ▁only ▁top - 1 0 ▁finish ▁of ▁the ▁season ; ▁making ▁this ▁event ▁one ▁of ▁attr ition . ▁ ▁Pear son ▁drove ▁his ▁Ford ▁Tor ino ▁T alla de ga ▁to ▁one ▁of ▁his ▁eleven ▁vict ories ▁of ▁the ▁ 1 9 6 9 ▁NAS C AR ▁Cup ▁Series ▁season . ▁Spe eds ▁were : ▁ ▁as ▁the ▁average ▁speed ▁and ▁