# FS, almost NEW, LS6 #243 heads

**URL:** <https://forums.speedlife.net/t/fs-almost-new-ls6-243-heads/23436>\
**Category:** Classifieds\
**Created:** [January 22, 2007, 3:11pm UTC](https://forums.speedlife.net/t/fs-almost-new-ls6-243-heads/23436 "2007-01-22T15:11:27Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Studderin](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/studderin/32/7197_2.png) [@Studderin](https://forums.speedlife.net/u/Studderin)\
**Post date:** [January 22, 2007, 3:11pm UTC](https://forums.speedlife.net/t/fs-almost-new-ls6-243-heads/23436/1 "2007-01-22T15:11:27Z")

</div>

I just took these off, its weird working on such a fresh motor…04 ZO6 had a new LS6 motor replaced under warrenty, and now its getting modded. They only have about 20miles on them, from the dealer bay right to the shop. The ext valves still have a white GM ID paint tab that hasn’t burned off yet. lol

LS6 Casting #243 little info  
64.xcc rasies stock CR to 10.4:1 from 10.1:1 on LS1s  
D shaped ext ports, better flow int, and ext, about 15-25cfm more then LS1.  
Exhaust vales, light weight, sodium filled, hollow stem  
light weight, int vavles  
springs good for up to .550 vavle lift

Great deal, **$500** for the set ready to bolt on. can be ported for extra $600  
can get pics tomarrow if nedded.  
New form GM there about $750-800 unshipped ![http://www.newyorkfbody.com/templates/Athena/images/spacer.gif](http://www.newyorkfbody.com/templates/Athena/images/spacer.gif)