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Depends on year and wheel. Early year thin spoke were forged and later year were cast. I believe that the 01 wheels are Alcola and were forged. 02 and later say "speedline" on the inside of the spokes and were cast.
Thanks. I have an early 2000. One rim is slightly out of round and another looks to have a small crack at the bottom of a spoke.
The cracking at the base of the spoke is a common issue of the early forged wheels. The inside edge of the spoke will have the letters GM
that looks like they were inscribed with a pin punch if they are original GM wheels. There are a lot of reproduction wheels that look like the original GM wheels but they will NOT have either the GM or SPEEDLINE on the inside edge of the spokes.
As far as I know the wheel cannot be safely repaired. If you choose to look for used wheels as replacements, I believe that the cast SPEEDLINE wheels are a better choice than the forged GM wheels.
I personally would be very cautious about any used wheels. They might not be any better than what you have.
Thanks. Yeah they are GM wheels. I appreciate the help.