ive been wondering the same thing
i also have yet to blow mine. my 87 n/a has 115k on it, and ive had it since it had 108k. i too wonder if a previous owner changed the headgasket. sometime soon im gonna check the hg, and maybe put in a new one with arp studs. ive never reved mine past 6000rpm, and i usually shift into 2nd gear at 3.5, 3rd at 4, 4th and 5th around 4.5 (normal driving). sometimes ill shift around 6 though (rarely).
i hardly ever race (once in a blue moon), and i dont care for 1/4 mile times. i prefer long fast drives. i wonder if people who blow their n/a supra hg's blow them due to driving like theyre turbocharged.
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