Thanks everybody for your inputs. I have decided to have my car overhauled last Friday. Well, it was discovered that it has a damaged engine block cylinder (maraming deep scratches) and piston ring. Further, one of the pistons has deep cavities in its head. They recommended sleeving and to change the piston and piston ring.

Here are the major expenses I incurred for your info:

Liner = P1650
Sleeving = P2000
Piston = P1650
Piston Ring = P950
OH Gasket = P1250
OH labor = P3500

Again thank you for all the information offered here.