check for the both engine type & year of manufacture.
am no expert, nor auto engineer or a self righteous mechanic. my knowledge base is purely out of interest and time spend with my vehicles when at workshop.
I believe SA 310 (SWIFT of 90s) have different head layout then Cultus of 2000's
head job every 50,000 is nonsense.
proper maintenance, right amount of coolant, fans working on auto-switch, OEM parts & vigilant eye on vehicle temperature (in summer with CNG & AIRCON) can push sheda majha Tillo Ikki ustads out of business.
such ustasds survive on people who believe that fuel is only needed to run the car and manufacturer is IDIOT to write a user manual. It is a necessary book in each car requiring attention to know basics of car maintenance for optimum performance.