calif smog legal engine swap upgrade

Asked by May 08, 2017 at 11:49 AM about the 1990 GMC Sierra 1500 K1500 SLX 4WD Standard Cab SB

Question type: General

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

3 Answers

102,335

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.

80,015

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.

80,015

This might help you ----- https://www.bar.ca.gov/Industry/Engine_Change_Guidelines.html

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