243 heads
10-12-2011, 10:56 AM
#21
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I'm wanting to start my first build here real soon, plan is to use 243s. I'm interested in the heads that this guy from ebay you all were talking about is selling, I don't want to come off as stupid ( just paranoid), but this guy says in the item info..
2 - USED CHEVY GM GEN III 5.3 5.7 6.0 CYLINDER HEADS CASTING NO. 12564243,
"THESE HEADS WERE REMOVED FROM A 5.3 ENGINE, THESE ARE THE SAME HEAD CASTINGS USED ON THE LS2 AND LS6 EXCEPT THEY DO NOT HAVE THE SAME VALVES (valves are the same size) OR SPRINGS,"
The part about.. "They do not have the same valves (valves are the same size) or springs"
I'll be getting new springs for cam but can I use the valves on the heads already?
2 - USED CHEVY GM GEN III 5.3 5.7 6.0 CYLINDER HEADS CASTING NO. 12564243,
"THESE HEADS WERE REMOVED FROM A 5.3 ENGINE, THESE ARE THE SAME HEAD CASTINGS USED ON THE LS2 AND LS6 EXCEPT THEY DO NOT HAVE THE SAME VALVES (valves are the same size) OR SPRINGS,"
The part about.. "They do not have the same valves (valves are the same size) or springs"
I'll be getting new springs for cam but can I use the valves on the heads already?
10-12-2011, 11:59 AM
#22
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ok guys well i mite just be pulling the trigger on a set of these heads. i was probably going to do the PAC 1218 springs with the scorpian rockers but what kind of pushrods should i get?
10-14-2011, 04:03 PM
#23
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Where are you guys getting the 243's for $350 shipped? I am about to pull the trigger on some 243's with the hollow stem/sodium valves for 480! Now I know the ones with the Z-06 valves cost a bit more but 350 seems really cheap if there in ready to use condition....
10-14-2011, 07:02 PM
#26
remember the 01 z06/ls6 heads did not have the sodium and hollow valves. any head marked 243 or 799 (ls2) have the same casting and flow numbers. the only difference is the 02+ 243 heads have the lighter valves. you do not need them unless you plan on really upping your rpm limit.
