243 vs 799
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#9
11 Second Club
iTrader: (18)
Other than the valves the heads are identical and there is no difference in power. Even comparing 799 to 243 is like comparing 853 to 241 ls1 heads...the power difference is neglible (under 5hp at best, likely not even that much according to a whole slew of sponsors here who have done extensive dyno tests).
#11
TECH Veteran
iTrader: (14)
By pictures they are almost impossible to identify because they look the exact same. If you set a ls6 valve and a regular valve on a table you will see the ls6 valve is a tad longer and the weight difference between the two can definitely be felt by holding them in your hand.