12458123= Federal Emissions
12458124= California Emissions
This will undoubtedly fall on deaf ears, however I hope I can help just one guy out there. These are some of the nicest engines ever designed by any of the OEM'* Asian OR Domestic....Open Deck, Floating Pin, Powdered Metal Rods, Chain Driven Valvetrain,...such a shame GM didn't put this into another make that wasn't in process of shutting its doors at the same time this baby was just getting introduced. No, it'* not a 3.8 that will run for 300,000 miles(most won't anyway), but 250,000 is very possible with maintenance and care to the 3.5L.