Briggs n Stratton will run forever too, so will my 51 ford flathead tractor.
They're outdated for performance.
You can get them to run quick, for what they are... but they'll always be what they are AND were designed as...economy car motors. Turbo them, they'll eat rod bearings sooner than later, nitrous...bent rods....high rpm oil pump gear goes out.... nylon distributor drive gear.
Love'em... but they stay behind to keep the fire going while the big boys go hunting for blue ovals and bowties