calif smog legal engine swap upgrade
what do you think would be the easiest engine to swap my 1990 gmc sierra
k1500 with, concidering its going to have to pass the origanal smog test .
thank you - todd stewart
As far as I know in California any deviation from stock is a violation in the emission standards, so I think you stuck with stock equipment.
You could install a newer engine if you made the emissions system fully functional for the year engine. After a swap you would have to go to a smog referee to have your truck certified. I would do a lot of research before doing the swap.
This might help you ----- https://www.bar.ca.gov/Industry/Engine_Change_Guidelines.html
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