Spun bearing or collapsed lifter?
Spun bearing or collapsed lifter? over reved the motor, then the motor started knocking, sounded like it was coming from the top of the motor so figure it was probably a collapsed lifter. i take the heads off (checked pushrods rockers etc.) and all the lifters apear to be ok. the roller ***** show only normal wear a roll smoothly.the weird thing is that i found a piece metal (looked like a small piece of aliminum foil) on one of the lifters. 
could it be that i spun a bearing?. or could the lifter have internal damage eventhough externally it still looks new. by the way motor was built around 4k miles ago.forged pistons, lunati rods, arp rod bolts race coated bearings, ls6 ported oil pump, block has ported oil passeges but a reused the stock crank, the entire rotating assembly was balanced also. the car is a 98z m6
could it be that i spun a bearing?. or could the lifter have internal damage eventhough externally it still looks new. by the way motor was built around 4k miles ago.forged pistons, lunati rods, arp rod bolts race coated bearings, ls6 ported oil pump, block has ported oil passeges but a reused the stock crank, the entire rotating assembly was balanced also. the car is a 98z m6 Last edited by goodol'93z; Jun 4, 2006 at 04:55 AM.
oil pressure is @ 40psi at idle and goes up as it revs
zaner did you just replace the bearings, how hard was that. i have done many h/c swaps on both ls1 and lt1 but have never messed with bottom ends. should i take it to a shop? really dont want to. thanx
zaner did you just replace the bearings, how hard was that. i have done many h/c swaps on both ls1 and lt1 but have never messed with bottom ends. should i take it to a shop? really dont want to. thanx
havent checked the oil yet i will do that tonight. do you guys think i spun a rod or main bearing. how to tell which is broken, i need some guidence. remember the motor has lunati pro mod rods w/arp bolts thanks for all the responses. chriswtx the car is in kyle, tx. not to far from you 
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Verdad Gallardo I sold that motor to a guy wanting to do a swap into a non lsx vehicle, he didnt mind the bearing was spun and planned to rebuild it anyways. I took that money teamedit w/ a little more and bought a built ls1 w/ 34,000 miles.
I remember when I had my 99z28 if I ran it lower than 1qt low on the stick and reved the snot out of it the oil pressure would actually start to DROP! Not good. When it was full of oil I never saw a problem. I ran quite a few bottles of N2O through that engine however and it did have over 100,000 miles. 
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Originally Posted by Shinerbock07
**** so i guess if the car was made in 1998 for 1999 i have a **** block?
Let us say they were improved upon.
