As xulfiqar bhai often says a proper overhaul with new parts is always better than replacement.
Engine Valves 6,800 OEM Thailand.
Engine Rings 2,400 OEM Thailand
Engine pistons 6,400 OEM Thailand
Engine Gasket Metal OEM Thailand 2,800
China paper 1,200
Engine Main bearing OEM Thailand 2,800
Leath machine wala 6-8k labour.
Mechanic 6-8k labour.
Even if u use all Chinese parts the engine will be smooth and trouble free for 3 years or 50,000 km easily on CNG my guarantee.
As xulfiqar bhai said u just need a good mechanic.
First change your radiator new one China 4k, Thailand 8k. China will do the job.
Check the flanges and all metal and rubber lines & hoses that circulate the coolant and change immediately.
Use coolant ZIC or Abro or caltex whichever suits your budget. 500/L to 900/L good for 2-5 years easily with new radiator.
Invest 800 on T-Stat Valve.
Valve clearance 8-10 on intake valves and 10-12 on outtake valves for d13 and d15 both Cathy and EFi.
Forget the dreams of Dual VTEC, reliability is much important than power.
Do PM me your number if u want any reference of good mechanics or parts.
My 89 Accord has clocked 315,000 km and 2005 Civic 205,000 km and by grace of almighty Allah working excellent.
You can also PM Xulfiqar bhai but most probably his inbox remains full of queries all the time. PW should allocate him unlimited inbox keeping in view the time and efforts he devotes for users honorary.