This paper describes a novel 4-stroke piston S1 engine Combustion System (‘Marker’), designed and developed to meet the CAA Amendment S4358 of 1969 for car exhaust emissions for 1985 on 1969/70 vintage Leaded Gasolines.Combustion is initiated by a spark between a point anode and a diametrally placed Bar as cathode at the center of a spherical pre-combustion chamber.The 100-bar injected fuel collides with the bar cathode at BDC, finely atomises, and forms a ‘stratified charge’ by Einstein Vortex action prior to ignition within the Sphere, the cylinder being fuel dry. Ignition point is fixed 5° Early from Idle to full Power, due to the physics of Vortex action.This ‘Marker’ System can be built onto a slightly modified standard Monoblock; no complication in tooling, materials or production methods is needed for volume production.‘Marker’ will meet CAA Amendment S4358 ultimate, requirement for Exhaust Emissions, eliminating the use of so called Advanced Exhaust Emission Control Devices. Exhaust Gas Energy Recovery (EGER) is used for supercharging.A CAFE of 33 mpUSg is obtained on a 1.5 tonne vehicle with 0. 4CD using 1969/70 quality Leaded Gasolines.Widespread adoption of this Clean Marker System in the USA could save the Economy 3000 million tonnes of Crude Oil or circa 900+Billion US Dollars by 2000 AD. ‘Marker’ would seem to be worth serious consideration.