GMRL

I hope this is the correct forum. But I was working on an 08 Silverado a couple days ago and was curious what heads theyre putting on the new stuff. I checked the casting number on the head and saw 243. So I guess theyre using the LS6/LS2 heads on these things?

cherryelky305

iTrader: (2)

I think its the same castings but the 5.3's use different valve's, something about sodium filled exhaust valves i think? right?

silver-mod-o

iTrader: (15)

same valves, same heads... the 4.8's and 5.3's got them starting in '07... 799 is a new casting number their using too... same specs as the 243's

White_Hawk

iTrader: (3)

Are they machined the same? Are they a smaller bore version?

-Geoff

White_Hawk

iTrader: (3)

Anyone? Anyone? Bueller?

I am just wondering since I am planning on getting a V8 Colorado this summer.

-Geoff