Go Back  Offshoreonly.com > Technical > General Q & A
Is 540 too much for a Gen VI ? >

Is 540 too much for a Gen VI ?

Notices

Is 540 too much for a Gen VI ?

Old 09-01-2009, 11:31 PM
  #1  
Registered User
Thread Starter
 
Join Date: May 2007
Posts: 77
Likes: 0
Received 0 Likes on 0 Posts
Exclamation Is 540 too much for a Gen VI ?

Got my plan, parts, & builder to go 540 on a HP500. Pulled the engine, popped the heads and and noticed the sleeves were missing!
Oh wait, let me get a magnifying glass, there are sleeves in this GenVI. Is it really safe to bore these .0030 over to 4.5"? They're paper thin stock. Anyone tried chrome or nickacil for reliability? Should I find a Gen IV block or am I just paranoid parting with my 10K?
FrankRizzo is offline  
Old 09-02-2009, 01:12 AM
  #2  
Registered
 
Join Date: Jul 2007
Location: San Diego
Posts: 988
Likes: 0
Received 2 Likes on 1 Post
Default

I have known lots of guys that have turned Gen VI 502's into 540's.




Darrell.
DMOORE is offline  
Old 09-02-2009, 01:20 AM
  #3  
Charter Member # 55
Charter Member
 
Griff's Avatar
 
Join Date: Oct 2000
Location: Omaha/LOTO
Posts: 19,516
Received 1,783 Likes on 884 Posts
Default

Paranoid. No problem going .030 over.
Griff is offline  
Old 09-02-2009, 09:03 AM
  #4  
Registered
 
Join Date: Jul 2009
Posts: 264
Likes: 0
Received 0 Likes on 0 Posts
Default

.30 over is fine in a Gen VI block theyre a pretty strong block
cbellamore is offline  
Old 09-02-2009, 10:10 AM
  #5  
Registered
 
Join Date: Apr 2009
Location: STL
Posts: 237
Received 0 Likes on 0 Posts
Default

Umm, They don't have sleeves from the factory. Someone put them in because they one must have hurt the engine in the past. Gen VI blocks can go .60 over easy. I have a buddy running .100 over making about 700 hp right now and now problems for several years.
wfo1 is offline  
Old 09-02-2009, 10:33 AM
  #6  
Registered User
Thread Starter
 
Join Date: May 2007
Posts: 77
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by wfo1
Umm, They don't have sleeves from the factory. Someone put them in because they one must have hurt the engine in the past. Gen VI blocks can go .60 over easy. I have a buddy running .100 over making about 700 hp right now and now problems for several years.
If there were no sleeves they would have to be nickasil, not gonna make 700 hp with rings running on castiron (not for very long anyway).

Anyone heard of a Gen VI 540 making it to 400 hours? My plan is mild, just 9.3 to 1 comp & 5200 rpm, If I only get 580hp I'm still happy. Longevity is the main concern.

Last edited by FrankRizzo; 09-02-2009 at 11:12 AM.
FrankRizzo is offline  
Old 09-02-2009, 10:39 AM
  #7  
Registered
 
Join Date: Apr 2007
Location: NY
Posts: 258
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by FrankRizzo
If there were no sleeves they would have to be nickasil, not gonna make 700 hp with rings running on castiron (not for very long anyway).


Anyone heard of a Gen VI 540 making it to 400 hours?
Nobody's iron block comes with sleeves.... Not GM, Dart, World... Nobody.
cubicinches is offline  
Old 09-02-2009, 11:14 AM
  #8  
Registered User
Thread Starter
 
Join Date: May 2007
Posts: 77
Likes: 0
Received 0 Likes on 0 Posts
Default

Used the wrong term "cylinder wall" thickness is my concern
FrankRizzo is offline  
Old 09-02-2009, 11:26 AM
  #9  
Registered
 
Join Date: Apr 2007
Location: NY
Posts: 258
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by FrankRizzo
Used the wrong term "cylinder wall" thickness is my concern
The std. bore on a 502 is 4.466". Boring it to 4.500" removes .034" on the diameter, which reduces the cylinder wall thickness by .017"... a little more than the thickness of a couple sheets of notebook paper... a negligible amount. The cylinder walls are not hardened by any means to start with, so you're not removing any hardened surface either.
cubicinches is offline  
Old 09-02-2009, 03:41 PM
  #10  
Registered
 
Join Date: Oct 2005
Location: Millstadt, IL
Posts: 1,888
Received 18 Likes on 9 Posts
Default

Most of the CI increase comes from the 4.25 stroker crank. Only a few (7 or 8) CI are gotten from borring .030 over. A lot of guys bore .060 over. I would not go more than that.
jeffswav is offline  

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

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.