hi all got some marks onto of the piston and would like to know if they ok to re-use. i noticed them when i was swapping over the conrods to some forged ones. the engine was brought from a running 80,000 mk4 1.8t 20v agu engine code. i fitted the engine into my mk1 project got it all up and running and sounded and was running ok. only drove the car in and out of the garage as its not ready yet. havent cleaned the pistons just let them soak in clean petrol. rings looked fine no damage but bore no 2 and 3 have a mark on them it feels smooth. so here some pitures i took today
piston 1
piston 2
piston 3
piston 4
also cylinder bore 2 and 3 have a mark on them it smooth
cylinder bore 3
here is the valves none are bent
so what u think? are they doomed? or can i just go ahead and fit the head
edit. just been out and checked bore 2 and 3 . number 2 has no deep mark at all tryed scraping gently with my finger nail bore 3 has a mark bout 10mm long . i can get my fingernail in
piston 1
piston 2
piston 3
piston 4
also cylinder bore 2 and 3 have a mark on them it smooth
cylinder bore 3
here is the valves none are bent
so what u think? are they doomed? or can i just go ahead and fit the head
edit. just been out and checked bore 2 and 3 . number 2 has no deep mark at all tryed scraping gently with my finger nail bore 3 has a mark bout 10mm long . i can get my fingernail in