Bhai agar ap k engine mein itne problem nahe hai toe swap na kerwao.
Engine valves 3200
Valve seals 450
HeadGas kit 700
Engine oil 1400
Oil filter 250
Khiradia Labour 2000
Mechanic Labour 4000
Is the total cost of your problem with full perfection
Those engine which r overhauled 3 to 4 time need replacement.
Unless your car pistons ,sleeves and crunk is OK no need to replace it.
Visit this workshop in Lahore for minimum and perfect quality work.
Fully expert is Santro work.