Generation III Internal Engine 1997-2006 LS1 | LS6
Sponsored by:
Sponsored by:

LS3 valve relief question

Thread Tools
 
Search this Thread
 
Old 09-23-2011, 12:19 AM
  #1  
Launching!
Thread Starter
 
Fast 95 Z28's Avatar
 
Join Date: Aug 2008
Posts: 252
Likes: 0
Received 0 Likes on 0 Posts

Default LS3 valve relief question

Building a 408 stroker with a 2003 LQ4 block. About to order the rotating assembly from texas speed. I have LS3 heads for the build and was going to order the Wiesco 4.030" -8cc pistons. Part number is 10-K394X3. Does anyone know if these wiesco piston's will work with LS3 head's intake valve? One more quick question to double check my math. I'm shooting for a compression ratio of 10.8:1. I'm ordering .040" head gaskets assuming pistons are .005 out of the hole with 70cc heads and the 4" stroke. And of course the -8cc pistons. I appreciate anyones opinions before I drop $2300 for the rotating assembly!

Thanks!
Old 09-23-2011, 11:03 AM
  #2  
LS1TECH & Trucks Sponsor
iTrader: (4)
 
Sales4@Texas-Speed's Avatar
 
Join Date: Jan 2007
Posts: 1,768
Likes: 0
Received 7 Likes on 7 Posts

Default

All wiseco pistons already have a valve relief cut for LS1 and L92 valve sizes so there will be no problem there. My compression calculator came up with 10.7:1 with that combination.
Old 09-23-2011, 11:09 AM
  #3  
Launching!
Thread Starter
 
Fast 95 Z28's Avatar
 
Join Date: Aug 2008
Posts: 252
Likes: 0
Received 0 Likes on 0 Posts

Default

Originally Posted by JohnJanz@Texas-Speed
All wiseco pistons already have a valve relief cut for LS1 and L92 valve sizes so there will be no problem there. My compression calculator came up with 10.7:1 with that combination.
Thanks John, i'll be ordering a rotating assembly next week then! I just rounded 10.78:1 to 10.8:1 if thats the same number you got. Either way wanted to keep it under 11:1 due to running a carb with 91 octane. And keep DCR at 8.5:1.



Quick Reply: LS3 valve relief question



All times are GMT -5. The time now is 05:04 PM.