Hello All;
Just wondering if any one out there knows if say I was going to purchase and install a set of Doug Thorely headers (smog headers) on a 1977 E-350 C-class with a 460 if they pass the dreadfull smog test in the golden state.
Has any one here in Ca. done anything like this.
Thanks to all who respond.
I have a manifold leak that is getting a little worse, And from what I understand these 460's are nortorious to leak on the pass. back side. And headers are the only remedy to the problem.
Once again thanks,

 

If their smog headers I don't see why they wouldn't pass. As long as your truck doesn't have any other issues. I'm not in Ca. but we have the smog test here also. You should notice a nice little increase in power also with the Thorleys.. Good luck

 

Took the Dog house to inspect for the leak and its comming from the pass side second from the back, But the question is... I noticed no smog crap on the manifold , Doug Thorely offers 2 different headers for this conf. What would be the differance between smog and non smog headers? The headers are gonna run me about $400 from summit, Would I notice much difference in performance-gas milage with the headers or would I be better off just repairing the manifold, This particular 460 is pulling a 23' C-Class motor home
Did a search for these headers and summit seams to be the cheapest any other suggestions out there?
Thanks:

 

smog headers have a tube going into one of them from the air pump (i think) all you have to do is cap them off (they should have a screw in nut that blocks them off) and yes you will have noticeable power gains from the headers...remember the tool man... MORE POWER