roush 3500?

[El_Diablo]

so then whats the other number that you got from GM?

[Joseph Upson]

so then whats the other number that you got from GM?

GM parts direct doesn't list numbers, just cut off dates. I was made aware of a different casting number when I called a local salvager to price a pair and was asked which casting number and immediately received the answer to my question regarding why the pair of heads I sold had a different combustion chamber.