Originally Posted by kwiktsi

Once again guys, I know "right" from wrong- there was absolutely no debris in the pan, no aluminum shavings, no chunks, metallic residue- nothing, the bottom end was clean and new. All the bearings look brand new, the filter had nothing in it (cut it open earlier just to be sure since you guys are pushing the debris issue). If it broke a piston and did more damage than what it was, I would have pulled it, torn the whole thing down and gone forged. There is no way there was any further damage than the broken piston- this is not my first time repairing a broken motor. I came here, not to act like I know more than I do- but to ask what would prevent the lifters from pumping up aside from the basics in case there is any LSx specific quirk I am not familiar with. There are many people who rebuild these motors and just put assembly lube in the pump and make sure the bearings are coated fine and they have no issues just starting it up and let it build pressure, so I can't see how a motor that was already "wet" inside can't pump the lifters- and I am wondering if there is anything else to look for.

Also- I just took the pump out and apart, and as I suspected- it is like new inside, no damage, galling, DEBRIS, etc. The bypass was clean and moving freely, etc.. The pick up o-ring was damage free and properly seated also, so I am stumped here. I can't see all 16 lifters going bad, so it has to be something else. Either it just is air locked up top for some odd reason (although it has been running long enough, it should have passed) or something else. Anyone ever use the Trick Flow pushrods? Those are the only other things changed, but they are a simple part, can't see them being the problem. They are the correct length also BTW.

I came here asking those who may have encountered a similar issue what it may be and all I get is "you did it wrong"- I'm sorry if I don't completely tear down and rebuild every motor that ever has a problem. I tear it down, assess the damage and go from there. There are several motors that I have had to go through the whole thing after a break, but this motor did not and does not need it. I just need to figure out this issue, that's all. The culinder was clean, no scuffs, grooves, lines, etc., heads also held vacuum just fine. The damage and repair to the piston is absolutely not the issue here. I already pulled the pump since so many of you were convinced I did it wrong and the pump was bad for no reason- only to find it in perfect working order. I'll get it figured out. Thanks to those who have helped.
Joe

Originally Posted by VET4LES

Are the rocker arms adjustable? I have not worked on the LS2 but even with hydraulic lifters they must be adjusted.

Originally Posted by saplumr

"IF" this is on a C6 how do you not have the dash gauge and DIC gauge to check oil pressure from the beginning?

Originally Posted by TrackNoob

"there is none so blind as he who will not see...."

Okay, I was gingerly polite, but now I am going to be direct, but all in an attempt to help you:

You are a conflicted person. Just like Steve Irwin, you claim you know what you are doing, and yet something unexpected has happened that you failed to understand. With him, he had previous nips, bites, scratches, near misses, public concern, offical inquiry, media backlash, friendly warnings, unfriendly warnings, was drug by his pants, fell down, was dragged into water, slipped, and yet somehow he could claim with a straight face that he had it all under control even in light of all those many precursors and portents. Of course he is a dead man now....

Likewise, you are puzzled enough to reach out for input, but you think you will know what you ought to hear when you hear it, but you didn't know it enough to avoid needing to ask.

So I say again: I don't care if you think it spit most of the piston out of the exhaust; when you have parts coming loose in a recipricating assembly, when you subsequently disassemble it for repairs, ALWAYS use a BRAND new oil pump.

There, how's that?

Originally Posted by Cjunkie

altho i have never opened up an LSx engine but coming over from drag racing 5.0's for almost 15 yrs i can tell you ANYTIME i opened the pan it got a BRAND NEW oil pump i dont care if it had 1000 mi or 100000 miles anytime the pan came off it got a new oil pump and pickup....16.95 for a SBF oil pump was way to cheap of insurance, never had a problem.

Originally Posted by kwiktsi

Well, it is fixed- did not need a pump, did not need a complete rebuild, etc.. The oil pressure is good, motor runs strong, leak down is perfect and the compression is excellent.

The problem was part my fault and part the people I got my parts from. They sent me an LS1 headgasket, not an LS2 by mistake. It is my fault for not catching it, but when I order from a dealer by vin #, I don't think much of it- I just *****ume it is right.. The noise was the pistons catching the edge of the gasket. I was PISSED when I found out what it was, but it is all taken care of now.

Thanks to those who helped without insult.
Joe

Originally Posted by NORTY

8400rpm? Let's not do that again!