Heres a little general info.
Any engine that is of alloy head construction will run ULP fuel with no ill effects. Why?? Because the head is alloy it will be fitted with hardened seats.
Why was lead in fuel?? to lubricate the valve seat in cast iron heads as they were just cut into the face of the head.
So any alloy block Briggs and Stratton side valve engine will run perfectly well on ULP because the block has hardened seats in it.
