FML- Need everyones input- LOUD knocking

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Feb 21, 2011 | 01:05 PM

#21

LinearX

Pro

Joined: Aug 2006

Posts: 565

Likes: 2

From: Chattanooga TN

A spun rod bearing will make all kinds of noise and generally not affect oil pressure. A spun main will make all kinds of noise and will usually show a drop in oil pressure.

Feb 21, 2011 | 06:17 PM

#22

golfinz

Melting Slicks

Joined: Jul 2007

Posts: 2,087

Likes: 11

From: Austin TX

If your crank is still good, get a 6L iron block and reuse your crank, get a set of eagle or callies rods, weisco pistons, and new bearings and call it a day. The rings on the weiscos are great for FI. Figure around 3-3.5k for what I listed

Feb 21, 2011 | 07:31 PM

#23

corvette8189

Safety Car

Joined: Jul 2007

Posts: 4,456

Likes: 29

From: Wichita Falls Texas

Quote:

Originally Posted by golfinz

no matter what price u come up with, double it and youll get your real answer.

Feb 21, 2011 | 07:47 PM

#24

golfinz

Melting Slicks

Joined: Jul 2007

Posts: 2,087

Likes: 11

From: Austin TX

Quote:

Originally Posted by corvette8189

no matter what price u come up with, double it and youll get your real answer.

+1....unfortunately

Feb 21, 2011 | 07:53 PM

#25

jeff keyuk

Instructor

Joined: Sep 2008

Posts: 192

Likes: 1

From: Ashton

One day I beat on my C5 came to a stop, and had lifter noise, turn the motor off for a min. started the car up lifter noise gone, never hear it again. How is the oil psi?, Hyd.lifter calasped

Feb 22, 2011 | 04:54 PM

#26

madmatt9471

Team Owner

Joined: May 2006

Posts: 21,473

Likes: 356

From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----

Quote:

Originally Posted by spoon98hatch

Yeah how much could I get away with cost wise- assuming the crank is still good- forged pistons, rods and all bearings seals etc.

Sorry for the late response -

It could cost anywhere from $2000-$2500 if the crank is fine, for the block build and all forged parts

Thanks,Matt

Feb 25, 2011 | 08:19 PM

#27

golfinz

Melting Slicks

Joined: Jul 2007

Posts: 2,087

Likes: 11

From: Austin TX

update?

Feb 25, 2011 | 10:27 PM

#28

396375

Melting Slicks

Joined: Nov 2007

Posts: 2,197

Likes: 2

From: Niagara Falls NY

St. Jude Donor '08-'09

The only thing I have ever heard that was close to a knock in the bottom end that was not a bearing, was a cracked flexplate.Obviously that's not the case here.You can cut the filter open or send out a sample of oil to have it analyzed.A magnetic drain plug would also give you some clues.I hate to tell you but I think you are looking at a rebuild and I would count on 3K.If you don't want to screw with it tow it right to a pro LS shop.Hopefully if they pull it apart they can tell you what happened.Just fixing it without finding out what happened gives me nightmares.Even if it is a lifter all that debri has gone through the motor and may cause more problems down the road.Patching it up now will just add to your final cost.
Good luck.

Last edited by 396375; Feb 25, 2011 at 10:30 PM.