I believe the rule is that you can drop another engine into the car as long as that engine was offered int hat car from the factory.

But not too sure.

You may be able to get away with it.

I know for sure you can put a newer engine into a car, but you cant put an older engine into a newer car.

You need to check witht he california smog referee. Thats who would inspect the car to check to see if it passed smog or waive the smog if it wouldn't pass, and would cost more than the allowable limit for repairs.

I had an old GMC Jimmy, the big one, and it didnt pass smog, took it to the referee station, and they actually got the car to pass.

My mgb, cars notorious for hating smog equipment, passed with flying colors too, with all equipt working, which amazed me.

My benz has never had a problem passing with levels so low, the guy redid it to make sure his readings were right. my levels were so low, he wondered if something was wrong with his test equipment.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon - Sold
2006 E350 Wagon - 368 - Dead
2015 GL350 Bluetec - 197U