LS6 heads on 08 GXP????
Thread Starter
On The Tree
Joined: Aug 2007
Posts: 190
Likes: 0
From: Oregon
LS6 heads on 08 GXP???? Yesterday I stopped by my local pontiac dealership to get some parts for my car and noticed there were three 08 GXPs,went over there and checked them out if anything different compared to my 06 GXP [motor wise] and couldn't help notice that the heads are stamped with the #799 and mine are #243=LS6 and the throttle body was defferent too. my ? is that are the #799 heads from the new 5.3v8 truck and is the 08 gxp 303hp or is it over rated on hp#s. I believe that the CAFE standards/new ethenol fuel took a toll on the 08 Ls4s. .........................ps my 2004 gmc 5.3v8 has #703 heads......how does the #243 heads compared to the new #799 heads?? 
how are the 08 Ls4s producing 303hp without the #243/Ls6 heads??
how are the 08 Ls4s producing 303hp without the #243/Ls6 heads?? Last edited by Ls4GXP; Apr 23, 2008 at 07:59 PM.
799 and 243's are the SAME!
I have a set here off a tbss. Sometimes you will see a 243 on one side and a 799 on the other, just different vendors.
Use the main search and there is some info.
BTW I believe all 5.3's now come with the ls6 heads, I could be wrong though.
I have a set here off a tbss. Sometimes you will see a 243 on one side and a 799 on the other, just different vendors.
Use the main search and there is some info.
BTW I believe all 5.3's now come with the ls6 heads, I could be wrong though.
