The truck may pass emissions with the AIR gone. OR do your smog guys require that all factory emissions must be installed and functioning?

 

I live in British Columbia and the emissions testing here is about as strict as California if not tougher. Although they rarely do a visual inspection underhood, technically all factory emissions devices are supposed to be intact and operating.

I thought the AIR or Thermactor system added oxygen which greatly helps the CATs do their job? Anyhow I want to leave it working. If you dont have an Aircare pass here then you cant even insure your vehicle.

I think the fella here was right. Its only the heavy duty 351W, the ones mostly in the F-250-350?, that have the funky AIR plumbing right on the manifolds.

For anyone interested, Hedman headers is the only maker that has headers that will work on the heavy 351W. The headers include the air plumbing pipes. ANd the Hedman light duty 351W headers have the needed EGR pipe bung included so thats what I might get.

 

All of the 351 truck headers should have the EGR fitting, if they are smog legal.

 

Think about what I said in post 10, swapping is probably pretty feasible...there are a few other good options though. I know it sounds intimidating but it might be the best solution if all else doesn't pan out well. It would certainly clean things up under the hood.

Take the plastic fender wells off or move them enough to gain access, it'll help out a lot when working on the headers.

I must of got lucky, all the bolts for my 302's manifolds came right off.

About the bungs, if you can't find something to work, at the very worst you'd have to re-plumb some of the lines with hardware that would work, it's definitely do-able.

I still have a thread going in the 302/351 forum, fully detailed about the 393 project. If you look at the last few posts, you'll see where I am at

 

Which is which? (i need a terminology lesson here)

if that pipe that connects between the 2 cats is there to supply fresh air to the 2nd cat (to help it function), then if one was to cut off the 2nd cat, that pipe is then useless.
right?

 

On my 351w i had headman or was it hooker?

 

I found this from a 1988 Ford Factory manual ,the emissions supplement.

It shows the heavy-duty Windsor Thermactor plumbing and the light duty. As well as the exhaust for both.

 

You've got the 300 ci so it could be a much different setup than the 302 or 351


But if you have modded your exhaust such that the thermactor isn't flowing into the exhaust then it could affect emissions How much ? I dont know. One option though is an aftermarket replacement three -way cat with air(the little tube that sticks out of the cat) Would this do the job as good as the thermactor ?I dunno either...

 

correct, it's not doing anything anymore if there isn't a second cat.

 

Well its adding fresh oxygen to the atmosphere as he drives

 

Diluting the exhaust


my dad always says, "the solution to pollution is dilution"

 

I took a quick look at the fittings on my F-250, they don't look like anything totally special, so I'd say it's possible to weld in new bungs and install those on any header. The work would be a little difficult but definitely possible.

 

For sure. I dont have a F250 but looking at the diagrams of its system I t could be done. Be hard to get it to look nice with all that plumbing though. But then who cares how it looks, as long it goes like hell. Im a fan of sleepers for the street anyhow

 

Cool

Thanx

 

You could make it look factory installed....you could probably even use the factory tubing, just weld bungs in so the factory stuff will screw in. They arn't using "ford only" fittings....they use the same kind of fittings you can get at the hardware store.