[black69]

thanks for all the info, it looks like these heads were prone to failure. does an 68 l89 car have any other unique codes to look for? different sway bars? carb numbers? besides the block stamping ofcourse. and if 69 l89's we failing when they arrived at the dealer (using that one example) were they even worse at failing in 68? i know from owning the 65 396 vette i have, the early 65 l78 cars dropped a lot of their valves toasting the blocks (so i was told yrs ago), so that was fixed towards the end of production of the engine (and luckily my vette is at the end of the run and has its original block). from just reading this thread, i would think most of the l89 cars eventually toasted their blocks? unless tucked away and never beaten ofcourse.