@tho
bro ito po ba ung kay sadam? what can i say, maraming possible factor pag ganyan, its either nag change ang timing due to timing chain modification or what, pre detonation could be one pero i dont think it would cause that kind of problem since ang sinabi ng mekaniko ni dam na city driving lang cruising speed, insist kc na natunaw daw ung isang valve, nope kc kung natunaw dapat sabay ang dalawa, the way i see the piston malalim naman po ang pockets nya and walang tama sa valves, a lot of possible factors on this, as for the block and piston kung walang gasgas walang problema yan, pede pang gamitin, the way i see the head, yes kaya ko e repair yan...