what about if you put a head on an it leaks antifreeze into oil an locks up your motor due to anti freeze in oil spun the bearing from lack of lubrication/toar down motor an found that it was poor quality pinning and weld was sent to machine shop and pressure tested it saw for myself it was leaking between seats where it was pinned been a ase certified mechanic an lexus tech for 10 yrsnow been doing this for 45 and their trying to tell me it wasnt leaking might have to fly down an handle this.

ps your repairs might work if you didnt chince on the repair /and put in new seats /