Motor replaced anytime
Requirements:
- Vehicle cannot legally operate if there are visible emissions for more than 15 seconds in any 5-minute period
- For Drive Clean testing, the vehicle model year is the model year as designated by the manufacturer
- Vehicle must meet or exceed what were the emissions standards for the original motor when all original emission control equipment was functioning
- All emissions control equipment must be attached and functioning (equipment refers to what came with the replacement motor or be equivalent to what would have come with that motor)
Not sure what happened in your case (did you tell original facility it was an engine swap?). Phoned someone I know through a friend with an LS swapped S10, etested a couple of weeks ago with no questions asked or issues. Pulled in, said nothing, they did the two speed sniffer, out the door with a pass. Same as it's passed since the swap, numbers lower vs it's original 6 banger.