I will say the LS series engine is one thing GM got right. I haven’t opened it once in 300k miles. Still has the original rings bearings and gaskets. Replaced multiple water pumps, but that’s the closest I’ve gotten to having to get inside the engine. It has had piston slap on a cold morning the whole time, but GM says that’s “normal”.
I bought a new Pontiac station wagon in Feb 1965. I sold it in 1998 or so with over 444,000miles on it. I wish I still had it.