Wow… Click HERE - Photos and sound clips.
“The very evidence provided by the manufacturer
(GM) to indicate this condition is not a problem ultimately demonstrates that it is a problem.”
California BBB Arbitrator
“…a knocking engine could lower the value
of a vehicle by $4,000 to $6,000 at trade-in”
Charlie Vogelheim, executive editor for Kelley Blue Book
Detroit Free Press
“My 2004 8.1L is knocking with less then 2K miles”
post on pistonslap.com forum
It is a known issue with certain year LS1s. It goes away after warmup. Trading your car in? Go for a little drive first. Problem solved.
WOW, that sucks. Glad i dont have a tahoe, even though I really do like them.
I love how that guy had it vinyl’d, i would park right in front of the dealer as often as possible
i thought i noticed that when i would pull in gm’s at work…this don’t suprise me then :tdown:
:word:
I don’t quite see what the problem is?
.
Mine went away after i rebuilt 
GTPS WERE KNOWN FOR IT TO.
:tup: To this guy, probably easily cost GM the price of engine if just one person didn’t buy a GM because of this.
Well, i have blown up every GM engine I have ever driven…so I can say that from personal experience I wouldnt buy one.
But maybe this is God’s joke…since the almighty LS1 was built by the hands of God…maybe he just did it to be funny :lol:
:gotme:
It’s also considered “normal” for the 8.1 to go through a quart of oil every 1000 miles.
I’ve heard that too. These engines must have some wicked tolerances.
yeah gm is fucking evryone i have heard some of those knock pretty bad ive done a few piston replacements on the 3.4 in the venture vans and the new teflon coated pistons cured the noise but that is such a bandaid gm =the poop
Yep GM sucks
Gen III V8s like the LS1 and LS6 suck
So what exactly is wrong with these motors and what causes the problem?
Little or no skirts on the pistons (less mass) and the ring cluster is closer to the top of the piston (better combustion).
edit: It all means that the tolerances have to be that much tighter, wich is not easy on a mass production engine.
All GM owners should park their vehicles next to Nissans and Mazdas, the lifter tick will drown out the piston slap… 
true true…but hey at a 195k my old nissan still runs perfect and blows no smoke and has no piston noise…just the usual tick…
hahaha…
hey your car is ticking…
really? I’ve been driving it for tens of thousands of miles and your the first and only person to ever point that out to me… gee golly mister… thanks!
the ‘old school’ TBI 305s and 350s in the trucks will run forever. ive had a 350 in a 88 truck with 198,000 and it jsut needed a few new gaskets which i decided not to fix and get rid of the truck (bad move) and now i have a 305 in a 88 truck with almost 203,000 on it and its still purring like a kitten. those engins are the shit if u ask me