Which head is which?
09-18-2011, 11:21 AM
#1
Teching In
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Which head is which? I keep hearing conflicting things on this. What number is on a ls6 head and what is on an ls2 head.
Is it 243=ls6, 799=ls2? Or is it the other way around?
Is it 243=ls6, 799=ls2? Or is it the other way around?
09-18-2011, 11:41 AM
#2
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243s come on both LS6 and LS2 engines, the only difference being the 02-newer LS6 243s had sodium filled valves. From what Ive read, 799s came on the later LS2s.
09-18-2011, 01:38 PM
#3
Only Z06 vette 243 castings have the hollow stem (sodium filled exhaust)
valves which are 0.0236" longer to correct lifter preload with the smaller
base circle cam. All other 243s have standard length/weight valves. Also the
799 castings are identical in every way...some have reported seeing one of
each casting on 5.3 truck engines from GM.
valves which are 0.0236" longer to correct lifter preload with the smaller
base circle cam. All other 243s have standard length/weight valves. Also the
799 castings are identical in every way...some have reported seeing one of
each casting on 5.3 truck engines from GM.