Closer_2001

iTrader: (6)

I bought a new set of LS6 casting heads with stock valves and springs.

Edit: Sorry for the confusion, they were advertised as 2004 Z06 Heads. Hence, they should have had the light weight valves and Z06 springs.

I was not worried about the springs, as I will be replacing with upgraded springs. I am concerned about the valves, how can I tell if I have Sodium Valves vs. Regular LS1/LS6 Valves?

Scalpel

iTrader: (4)

Weigh them on a gram scale.

CharlieLed

iTrader: (1)

The first year of the LS6 (2001) did not have lightweight valves. All LS engines, LS1 and LS6, up to 2001 had the same valves. In 2002 the LS6 went to the hollow stem in the intake and the sodium filled in the exhaust. The weights went from 89 gr to 66 gr for the exhaust valve and from 100 gr to 75 gr. for the intake.

Closer_2001

iTrader: (6)

Yup - They are bogus.

I have a full set of stock 01 LS1/LS6 valves, so I used them to compare.

The intake valves are actually smaller and weigh 91 grams, are these from a truck?

The exhaust valves are stock LS1.

The casting are correct and brand new.