Driver Side Story Seems Like Rocket Science ......!! Get It Done In Front Of You And You Will Know The Right Side Of Story....!!
Either Head Or Block Or Maybe Both Gone Uneven....!! But Do Note That There's Limit Of Shaving Head And Block.....
Its Not A "Gola Ganda Ice' Which You Grind Everytime You Need ....(Its Already Face Once Changing Head Gasket right??)
Cultus Already Have Bad Pinging Issues......If You Face It Again And Again...You Might End Up Making CR's Higher Than Desired Which Will End Up Into Detonating And Severe Knocks And Non curable Heat up..
Then Even 3S Or 5s Or 10s or Whatever Ustaad Won't Be Able To Catch That......So Be Sensible And If Block Or Head Is Severely Damaged Due To Severe Overheat....Better Replace It....
Aluminum Blocks Are Way Too Much Sensitive When It Comes On Overheating ...!!