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**Gregski** · 02-24-2020, 02:35 AM

Not to be a bearer of bad news, but I am in Nor Cal and you will not pass SMOG. Also on my '74 the driver side stock manifold cleared fine, on the passenger side the triangle flange hits the frame. I do NOT recommend notching the frame.

You need to drop $10K on a GM E-rod engine to pass SMOG in California if you own a 1976 or newer truck.

https://www.gmperformancemotor.com/category/ERODE.html

also check out this video, this guy tried to do what you are about to

MG #59 - How hard is it to pass smog with an LS swap?

hope this helps, not being rude, just keeping it real, maybe saving you some headache

02-24-2020, 02:35 AM	#5
Gregski Post Whore Join Date: Aug 2014 Location: Sacramento, CA Posts: 10,887	Re: 73-87 5.3 exhaust manifold question Not to be a bearer of bad news, but I am in Nor Cal and you will not pass SMOG. Also on my '74 the driver side stock manifold cleared fine, on the passenger side the triangle flange hits the frame. I do NOT recommend notching the frame. You need to drop $10K on a GM E-rod engine to pass SMOG in California if you own a 1976 or newer truck. https://www.gmperformancemotor.com/category/ERODE.html also check out this video, this guy tried to do what you are about to MG #59 - How hard is it to pass smog with an LS swap? hope this helps, not being rude, just keeping it real, maybe saving you some headache Attached Images