I have a 1977 F250 with a 460....First of all i'm in California , so that mean i gotta smog the beast . I just bought my truck a couple months ago now i have it all ready to go have fun , But i gotta get it smogged ....

the truck currently has headers running straight to the mufflers ,its dual exhaust, my question is are headers California legal and did the 77's come with a Catalytic Converter... PLEASE HELP

 

The F250's didn't have catalytic converters. A quick way to tell is does the fuel gauge say "fuel" or "unleaded fuel"? another check is does the fuel filler have the restrictor in it?
Can't answer about the smog tests. I live in Florida, we don't know what smog tests are.

 

ya here in alberta we cut our cats out LOL gotta love a straight piped 300

 

It has dual gas tanks and I think it says unleaded fuel only .... what would be the diffrence between unleaded and only fuel ?

 

Your vehicle maybe Exempt do to age of the vehicle.
It may come down to how its registered in your state.

I don't think the headers would NOT matter.
They will take a sample of the tail pipe gases.

I'd let them tell me what it needed, if it needs anything at all.

My 74, had the EGR blocked off, and passed everytime.
I finally removed it for good, never needed it.

I wouldn't sweat it, let the DMV Emissions worry about it.
Enjoy the Ride.
Good Luck, BUB.

 

In California Smog Excempt is only good for up to 1976.. Im short by a year ,the truck is all original but does have header . Would header be something that came from factory ?
Thanks for replying

 

Nope, headers are aftermarket. Too bad on the cut off date, too.
If its a 77 model year, it was built in 1976. Although this doesn't help your situation, many of us swapped out leaking exhaust manifolds, for headers.

I had a 360 in mine, and when they stopped selling Leaded gas, I had 80k for mileage. I had the heads done ( valve job ) and the manifold studs removed.
This was do to the fact that they broke off, trying to fix the leaking exhaust manifolds several times. But, after that... I never had a problem.

Headers really are the best replacement in many ways.

If your Cat has been removed, and your running a bypass tube, your running unleaded gas,...... its really no different the a 76 model or earlier models running without anything....and passing the "sniffer test" at the tail pipe.

Not to worry, my friend.

 

77 F250 most likely did not have a cat under it, especially if it is over ~7500 GVW.
Headers may/may not keep it from passing the smog test. Only one way to know, take it in and get it checked. Just make sure the PCV system is all hooked up and working correctly, and that the engine is tuned up as close to factory specs as you can get it.
The sniffer test requirements are no stricter now, than they were in 77 when this truck was built, for this model truck. Newer vehicles do have stricter standards, but these standards were already in place at the time of manufacture.