I have a 95 formula with a stock LT1, and an auto repair place replaced the radiator cap with a generic one, and I don't think it holds under pressure, as coolant has stained the area all around the cap. I'd like to put a stock GM cap on there, but don't know the part number. Thanks. If this is in the wrong forum, please let me know the correct place to post this.

 

10316828- 6.96 is factory list.