2002C5COUPE

iTrader: (3)

Well if a proffessional machinist was recommending to you not to use them, would you tell them to go ahead and stick them in because the internet said they'd be ok?

How do you tell a guy with 25+ years of experience of building all kinds of engines, from stock to pro comp., that he doesn't know what he's talking about???

joshluther

iTrader: (24)

You don't, but he probably doesn't use to many USED factory parts in his race engines.

2002C5COUPE

iTrader: (3)

I'm sure he's used a used piston or 2 before. He's not an internet machinist.

04BlackSilverado

iTrader: (6)

I do not undersatand how someone can buy a "used" product and hold it to "new" standards....

Its like if I bought a 84 Chevy Silverado, and it has 250,000 miles... Why did the tranmission go after I only drove it 20,000 miles???

This does not pass the common sense test

I am no machinist, internet or not, but I do not feel that the pistons are unuseable for the reason you stated. You should have no problem selling them here or on eBay if you do not want to use them. I know a few people that can get you a set of LS2/LQ9 pistons and rods for a good price....

but they are used.

Tootall

iTrader: (79)

that depends on what they're going in, and what you're expecting out of them.

So what are you building, or are you trying to sell them?

2002C5COUPE

iTrader: (3)

Well when the seller assures the buyer that the item is good and guarantees them by saying this:

"I am in no way trying to hide anything from you, I am just selling a good set of pistons and rods.

If you feel that this is not a good deal then I will refund your $$."

And then my machinist says that he would not recommend running them. I now feel like it was not a good deal, then the seller needs to keep his word and refund my "$$"

Just like you stated you are NOT a machinist, so who are you to say they are good to run, and that they are being held at TOO high of a standard.

So what am i supposed to do now?

7 new pistons @ $56 ea. =$392
7 sets of rings @ $23 ea= $161
8 rods and 1 good piston=$200

So you expect me to pay over $760, to have a decent set of STOCK rods and pistons???

04BlackSilverado

iTrader: (6)

I think that he is expecting to have NEW pistons for his build. I have never stated in any way that they are in any condition other than used.

This is in reference to the fact that he he had already paid me and saw the post where I purchased them form, and in the post that I bought them from the seller said they were used as well. I gave him all the info that I replaced the piston in question and had the rest checked out for other cracks. So he knew that at least one piston had been cracked.

I replaced the one cracked piston and had the others looked at and was told that they are all set.

You bought a used set of pistons..... bottom line they are used
Did your builder just say he would "not recommend" to use them, or that you CAN'T use them???

If you want NEW pistons then you"ll have to spend $700+ dollars

But you bought USED pistons and you get what you pay for.

12secSS

iTrader: (30)

2002C5COUPE,

I think your machinist is an idiot, if he indeed rejected these pistons based on the skirt measurement variance of .007". I am a Mechanical Designer and deal with CNC machinist and fabrication day in and day out, for the past 10 years. The measurement of .007" variance of the piston skirt is within tolerance specs for OE stock replacement piston, even high performance pistons. All the skirt does is hold the piston from rocking in the bore, one being .007" off from the next will not be noticeable in a build. My impression of this thread is that you no longer want these pistons due to some other reason you wish not to disclose. That is fine, but to say that those minute variances are cause for the pistons to be un-useable is ignorant, no reputable machine shop will ever reject pistons for that reason. That .007" would equate to .003" to undersize or .004" oversize. There is nothing wrong with that measurement. Now if it was to the crown, it could be argued if you were blueprinting an engine with these pistons. But if I were doing that, I would not use used pistons.

04BlackSilverado

iTrader: (6)

Thank You

2002C5COUPE

iTrader: (3)

Wow, I'm impressed, you're a mechanical designer that has dealt with CNC machinists for the past 10 years .....How many engines have you built? How much experience do you have of ACTUALLY have machining, building, and running hundreds of different kinds of engines? I'm not talking internet experience either.

BTW the variances were between .003-.009". He didn't want to use them because he said there was a good chance of them rocking in the bores, causing piston noise (i can't remember exactly the way he put it). That's within OE specs?? Then why did the new one not have these variances??

Why would i no longer want these pistons? I'll be going back with stock pistons, so what difference would it make?? I would love for this to not have happened, and for them to be good, and not be f'd over by a board member. I bought them with the seller's word that they were good and that if i was not happy that i would get a refund. Well, you see how much someone's word is worth now i guess.......