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, $500for 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