sounds like my 87 Supra 7M-GTE engine.
In this case the head bolts were under-torqued from the factory.
Eventually every engine would blow it’s head gasket....like mine did.
Toyota knew about this prob for years and did nothing about it.
I actually had my valve covers off while replacing those gaskets once....the head bolts were RIGHT there, i coulda torqued them down....ugh
This was before the internet and i had no idea about the prob at the time..
Thanks toyota...
Thanks for the tip Well that sucks to lose your Supra.
IMHO don’t just retorque ‘em, replace them. Apparently they were specified to go past the elastic limit, i.e. they want them to stretch to fit or something. That’s would be a recipe for failure or misfit at rated torque in time.
If they stretch to fit inelastically (semi-plastic instead of fully elastic behavior ) it would explain you thinking they must have been undertorqued from the factory, after the dissimilar metals had expanded and contracted over and over.
I want that Camry back and my daughter never stuck beside the road and where that might have gone, and I’m sure you would want your Supra back if you are like my Supra lover friend from those good ol’ days.
Regards and Cheers, or I should say Kanpai!