Heavy half smog question

[4X4HIGH]

I used to own a 76 K5 (until someone thought they needed it more than me). If the rig is a 50 state then it requires a smog pump but if it's a 49 state then no pump required. If there's no decal in place and a smog shop can't determine 49 or 50 state then it will be required.

 

[ChrisPerry]

cats started in 75 on cars or lower gvw trucks. air injection has been around since the late sixty`s.unless some body stole the cat off our factory stock Z28 302 .

Okay, I've never had anything with a smog pump that didn't have a Cat. I didn't know that they started first. Thanks for the info.