I don't study engine design, but I know enough to know I don't want one of these beasts in my Beast LOL.
but, thinking back in the 80s was it? weren't GM's dual overhead cam engines also a nightmare with timing belts?
https://www.wardsauto.com/news-analysis/gm-may-mothball-dual-cam-34l-dohc-v-6
Yes, my wife has an 07 Suzuki XL-7 SUV that has a chronic check engine light.
When I check it with my code reader it states there's a cam/crankshaft timing anomaly.
Turns out the General Motors V-6 in her Suzuki is of the overhead cam variety with multiple cam chains in the front of the motor.
A quick check of the Suzuki Web Forum verified that it is indeed a known problem with these rigs...terrific!
Stretched timing chains, worn guides, etc...
Problem is, its a transverse mounted engine and the only way to remove it is through the bottom of the vehicle.
I only have a 4 post lift in my shop, not the 2 post type lift required to lift a body off of an engine/drivetrain...so, it sits awaiting repairs.
The actual chain replacement isn't a big deal, something I could easily do...if only I could remove the motor to gain access!
I've never been one to pay anyone to work on our vehicles, ever...I always do all my own maintenance, so this is an especially frustrating fix we're in with the rig.