Notices
C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette

LS7 Conversion

 
Old 02-07-2018, 02:04 PM
  #21  
Bee Jay
CF Senior Member
Thread Starter
 
Bee Jay's Avatar
 
Member Since: Nov 2005
Location: Lompoc, CA. Santa Barbara County
Posts: 3,509
Received 56 Likes on 41 Posts
Default

Originally Posted by PainfullySlow View Post
OP: out of curiosity, how the hell did you convince the dealer to let you keep the old engine? Unless things have changed in the 25 years since I worked for GM Parts, they always wanted the warranty items back.
He had to keep it a couple of months after they put in my warranty engine. GM didn't want it back, and he didn't want it to continue have it laying around. I guess GM has several LS7s returned with rod bearing failure or valve guide failure. They didn't need another one, especially since cars aren't produced with that engine anymore.
Score!
Bee Jay is offline  
Old 02-07-2018, 04:13 PM
  #22  
PainfullySlow
CF Senior Member
 
PainfullySlow's Avatar
 
Member Since: Sep 2017
Location: Tolland CT
Posts: 1,236
Received 329 Likes on 217 Posts
Default

Originally Posted by Bee Jay View Post
He had to keep it a couple of months after they put in my warranty engine. GM didn't want it back, and he didn't want it to continue have it laying around. I guess GM has several LS7s returned with rod bearing failure or valve guide failure. They didn't need another one, especially since cars aren't produced with that engine anymore.
Score!
Score indeed, and that is really good to know. Back when I was there, they wanted every single part back, no exceptions. If things have changed it is time to give my friend in the business a call and have him snag a LS7 for me.
PainfullySlow is offline  
Old 02-07-2018, 11:35 PM
  #23  
Bee Jay
CF Senior Member
Thread Starter
 
Bee Jay's Avatar
 
Member Since: Nov 2005
Location: Lompoc, CA. Santa Barbara County
Posts: 3,509
Received 56 Likes on 41 Posts
Default

Originally Posted by PainfullySlow View Post
Score indeed, and that is really good to know. Back when I was there, they wanted every single part back, no exceptions. If things have changed it is time to give my friend in the business a call and have him snag a LS7 for me.
I should mention that I'm real good friends with the service manager, and good friends with the owner of the dealership.
It's a small town.

Last edited by Bee Jay; 02-07-2018 at 11:38 PM.
Bee Jay is offline  
Old 02-08-2018, 11:55 PM
  #24  
Bee Jay
CF Senior Member
Thread Starter
 
Bee Jay's Avatar
 
Member Since: Nov 2005
Location: Lompoc, CA. Santa Barbara County
Posts: 3,509
Received 56 Likes on 41 Posts
Default

I finished the tear down today. Like I said, the LS engine is different. The engine is tight, even after 7000 miles. It was very difficult to rotate the engine with pistons, rods, and Cam. But after removing the pistons, rods, and camshaft, it still took 60 lb ft to rotate the crank. There are six bolts for every main cap! Take a look at the rod bearings and the crank main bearings. It doesn’t look like the other rod bearings were going to last long. The middle main cap has a larger bearing like what is usually in the back of a gen 1 small block. Is the thrust bearing in the middle of the block?!!!! The two rods that discolored don’t look bad! Can they be reconditioned? The crank looks great except where the rod bearings spun. My next step is to see if the crank can be saved and repaired, and the same for the two rods. Then I’ll have the block lightly honed and cleaned. Look at the tiny rod bolts.









Bee Jay is offline  
The following users liked this post:
PAPADOC (04-01-2019)
Old 02-09-2018, 07:33 AM
  #25  
L88Plus
CF Senior Member
 
Member Since: Aug 2004
Location: Lubbock TX
Posts: 1,726
Likes: 0
Received 54 Likes on 46 Posts
Default

Those should be titanium rods. You might find that the dark color is baked-on oil and it comes off when they're run through a blast cabinet. Crank looks like it will take a turn, no big visible grooves cut into it.
Make sure you have that block line honed before it goes back together!
Good for you, being able to keep it. That's several thousand dollars worth of parts, even unassembled!
L88Plus is offline  
Old 02-09-2018, 08:05 AM
  #26  
Gordonm
CF Senior Member
 
Gordonm's Avatar
 
Member Since: Dec 1999
Location: Voorhees NJ
Posts: 18,833
Received 209 Likes on 182 Posts
Default

Just curious on what the root cause of this is. I don't spend much time over in the other forums or LS forums but is this common on the LS7 motors? what is the fix if this is an issue. That crank on the rod journals looks ugly. Hopefully it can clean up.
Gordonm is online now  
The following users liked this post:
tudedude (02-10-2019)
Old 02-09-2018, 08:25 AM
  #27  
jb78L-82
CF Senior Member
 
jb78L-82's Avatar
 
Member Since: Oct 2007
Location: Rhode Island
Posts: 6,365
Received 445 Likes on 397 Posts
Default

Gm changed the rod bearings in 2013 only on the LS7 and after that change, LS7 engines began to blow from spun bearings. 2013 only!!
jb78L-82 is offline  
Old 02-09-2018, 08:37 AM
  #28  
Gordonm
CF Senior Member
 
Gordonm's Avatar
 
Member Since: Dec 1999
Location: Voorhees NJ
Posts: 18,833
Received 209 Likes on 182 Posts
Default

Originally Posted by jb78L-82 View Post
Gm changed the rod bearings in 2013 only on the LS7 and after that change, LS7 engines began to blow from spun bearings. 2013 only!!
Save a few dollars on rod bearings vs replace LS7 long blocks? Obviously not one of GM better ideas. Yikes!
Gordonm is online now  
Old 02-09-2018, 12:50 PM
  #29  
jb78L-82
CF Senior Member
 
jb78L-82's Avatar
 
Member Since: Oct 2007
Location: Rhode Island
Posts: 6,365
Received 445 Likes on 397 Posts
Default

Originally Posted by Gordonm View Post
Save a few dollars on rod bearings vs replace LS7 long blocks? Obviously not one of GM better ideas. Yikes!
No kidding! At least I don't have that worry with my 10C6Z06....just exhaust valves breaking and blowing the LS7 engine. Mine has 4,200 miles on it and I have to get to the head fix one of these days.....

Last edited by jb78L-82; 02-09-2018 at 12:50 PM.
jb78L-82 is offline  
Old 02-09-2018, 02:57 PM
  #30  
Bee Jay
CF Senior Member
Thread Starter
 
Bee Jay's Avatar
 
Member Since: Nov 2005
Location: Lompoc, CA. Santa Barbara County
Posts: 3,509
Received 56 Likes on 41 Posts
Default

Originally Posted by Gordonm View Post
Save a few dollars on rod bearings vs replace LS7 long blocks? Obviously not one of GM better ideas. Yikes!
Hey Gordon!
Actually GM wanted to sell the 2013 427 Corvette Convertible in Europe, so only the 2013 LS7 has "lead free" rod bearings. These bearings are failing at a phenomenal rate, some say 25%. Of course mine failed one week after I purchased it, because I put my foot all the way into it. Fortunately, the car was still under the original warranty, and they put a new Z28 Camaro LS7 in with leaded bearings. I guess the cheap thing GM did was not to test these lead free bearings. They should do the right expensive thing and recall all 2013 LS7s and replace the rod bearings. I'm told its not if they will fail, but when they will fail.
Bee Jay
Bee Jay is offline  
Old 02-09-2018, 03:45 PM
  #31  
Big2Bird
CF Senior Member
 
Big2Bird's Avatar
 
Member Since: Dec 2006
Location: Anaheim Ca.
Posts: 7,027
Received 447 Likes on 418 Posts
Default

So how much is a new crank and two rods? (Just sayin).
Big2Bird is offline  
Old 02-09-2018, 06:26 PM
  #32  
69427
Tech Contributor
 
69427's Avatar
 
Member Since: Jun 2004
Location: I tend to be leery of any guy who doesn't own either a chainsaw or a handgun.
Posts: 12,770
Received 208 Likes on 171 Posts
Default

Originally Posted by Bee Jay View Post
Hey Gordon!
Actually GM wanted to sell the 2013 427 Corvette Convertible in Europe, so only the 2013 LS7 has "lead free" rod bearings. These bearings are failing at a phenomenal rate, some say 25%. Of course mine failed one week after I purchased it, because I put my foot all the way into it. Fortunately, the car was still under the original warranty, and they put a new Z28 Camaro LS7 in with leaded bearings. I guess the cheap thing GM did was not to test these lead free bearings. They should do the right expensive thing and recall all 2013 LS7s and replace the rod bearings. I'm told its not if they will fail, but when they will fail.
Bee Jay
A couple things. I wonder how all the European manufacturers deal with this same bearing material restriction.

I agree that there's probably going to be others who will have or had the same luck/experience with this issue. But also, there's no shortage of Corvette owners who buy these things for the image (and the ability to carry a bag of golf clubs), and these cars are rarely ever going to see any serious hard driving, so I would be surprised if your engine failure experience isn't in the minority of owners.
69427 is offline  
Old 02-09-2018, 06:58 PM
  #33  
Bee Jay
CF Senior Member
Thread Starter
 
Bee Jay's Avatar
 
Member Since: Nov 2005
Location: Lompoc, CA. Santa Barbara County
Posts: 3,509
Received 56 Likes on 41 Posts
Default

Originally Posted by Big2Bird View Post
So how much is a new crank and two rods? (Just sayin).
Iíll keep you posted!
Bee Jay is offline  
Old 02-10-2018, 08:23 AM
  #34  
L88Plus
CF Senior Member
 
Member Since: Aug 2004
Location: Lubbock TX
Posts: 1,726
Likes: 0
Received 54 Likes on 46 Posts
Default

Originally Posted by Bee Jay View Post
...and they put a new Z28 Camaro LS7 in with leaded bearings
Please fill us in on this - I was under the impression that the ONLY car that ever got an LS7 was the Z06...never heard of a Camaro getting one from the factory.
L88Plus is offline  
Old 02-10-2018, 09:39 AM
  #35  
3X2
CF Senior Member
 
3X2's Avatar
 
Member Since: Jan 2000
Location: home
Posts: 2,072
Received 157 Likes on 132 Posts
Default

2014-15 Camaro Z28 came with dry sump LS7 engines.
Attached Images  
3X2 is offline  
Old 02-10-2018, 11:19 AM
  #36  
Gordonm
CF Senior Member
 
Gordonm's Avatar
 
Member Since: Dec 1999
Location: Voorhees NJ
Posts: 18,833
Received 209 Likes on 182 Posts
Default

Originally Posted by Bee Jay View Post

Iíll keep you posted!
Please do. Interested. Also going to run up the bill getting all the added dry sump pieces and all the "rest" of the motor. It will be worth it though. I would have the heads cleaned up and put in a better cam. You will easily have over 600HP.
Gordonm is online now  
Old 02-10-2018, 04:43 PM
  #37  
jim2527
CF Senior Member
 
jim2527's Avatar
 
Member Since: Apr 2003
Location: Tampa Florida
Posts: 15,716
Received 178 Likes on 155 Posts
Default

Originally Posted by L88Plus View Post
Please fill us in on this - I was under the impression that the ONLY car that ever got an LS7 was the Z06...never heard of a Camaro getting one from the factory.
2006Ė2013 Chevrolet Corvette Z06
2008 Spada Codatronca
2013 Corvette 427 Convertible
2007 CSV GTS
2008 HSV W427
2012 New Zealand V8SuperTourer
2014-2015 Chevrolet Camaro Z/28
Vertical Hummingbird helicopter[14]
2012Ėpresent Falcon F7
2014 Korres P4
jim2527 is offline  
Old 02-10-2018, 06:02 PM
  #38  
Bee Jay
CF Senior Member
Thread Starter
 
Bee Jay's Avatar
 
Member Since: Nov 2005
Location: Lompoc, CA. Santa Barbara County
Posts: 3,509
Received 56 Likes on 41 Posts
Default

Originally Posted by Gordonm View Post
Please do. Interested. Also going to run up the bill getting all the added dry sump pieces and all the "rest" of the motor. It will be worth it though. I would have the heads cleaned up and put in a better cam. You will easily have over 600HP.
One tank and two lines is all I need. Iíll put the tank here, where my Accusump is now.
Bee Jay is offline  
Old 02-10-2018, 06:41 PM
  #39  
GUSTO14
CF Senior Member
 
GUSTO14's Avatar
 
Member Since: Sep 2003
Location: eastern NC
Posts: 7,309
Received 855 Likes on 740 Posts
Default 2015 Z06 Dry Sump Tank and Lines For Sale

GUSTO14 is offline  
Old 02-12-2018, 10:11 AM
  #40  
Bee Jay
CF Senior Member
Thread Starter
 
Bee Jay's Avatar
 
Member Since: Nov 2005
Location: Lompoc, CA. Santa Barbara County
Posts: 3,509
Received 56 Likes on 41 Posts
Default

Oops, looks like I have to buy at least one piston! Maybe Iíll upgrade to eight forged pistons.
Bee Jay is offline  

Thread Tools
Search this Thread
Quick Reply: LS7 Conversion


Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: