Z06kern

iTrader: (18)

I broke a timing chain at around 4500 RPM. I pulled the heads off and found that I had bent just about every valve. These pistons only have about 5k on them. I took a picture of the piston that looks the worst, all the others look better then this one. Do you think they will be OK if I just file down the rough edges and make them smooth? The damage to the pistons are not as bad as I thought it would be. I was planing on spraying a 200hp shot on this motor. Just looking for opinions. Would you change the pistons out or not?

Pic:

LETHL_SS

iTrader: (21)

What timing chain were you using? I'd think it would be ok if you smoothed out the pistons..... they dont look too terribly bad.

slow trap

iTrader: (22)

if that is the worst one you shouldn't be too worried, alittle sanding will make them good as new.your pistons look very clean,what quench are you running ? sorry about the bad luck,timing chains seem to be a rare problem on these motors unless they are wore out something fierce.

Krab

iTrader: (28)

That really doesn't look bad at all. I smacked a few pistons a while back and looked worse than yours. I just smoothed mine out and have been running with them since. No problems yet.

ROCNDAV

iTrader: (100)

Were you running a single or double chain?

Armageddon

iTrader: (41)

If that's the worst one then your ok in my book. Smooth the lip on the dish so it doesn't create a hot spot and put it back together. Could have been a lot worse brother.

erikthegoalie

iTrader: (29)

what chain???WOW

Z06kern

iTrader: (18)

Thanks guys! I really did not think the damage was that bad. Its good to get some other opinions though. I'm going to get a valve job done on the heads and put it back together.

I was running a single rollmaster chain. I took the chain off of another motor with very few miles on it. Maybe that chain had streched some how, I don't know. This is on a C5R block so I'm going to replace it with a the JWIS chain and run a timing chain dampener. The chain did seem loose compared to other LS1's I have worked on.

dnm12

iTrader: (13)

let rollmasters now about that they gave me some speal about 10K all day nothing about 4500K not that long