[JMitch19]

Check car-parts.com I found a set of 243's off a 2009 5.3 for $300. They looked brand new when I got them.

My understanding is that the 799's and 243's are the same exact head. The difference is that they are cast at different plants.

The only 243's with light weight valves came on c5 zo6's. Any 243's that came off 5.3's are going to have the heavier valves. A set with light weight valves will normally sell for about $100 extra, but they are getting very hard to find.