Exhaust manifold no longer made- option?

Please disregard my reply, I forgot he was working on a car and not a truck.

Thanks,
Lee Richardson



"Lee Richardson" > wrote in message
...
> Chances are it is original.
> While I am not at all familiar with Ford products, I do know that back in
> that era 49 state trucks over about 6000 pounds GVW were exempt from
> emission controls, and were designed to be operated on leaded or unleaded
> fuel.
>
> So while I can see someone going to the trouble to remove an air pump and
> all it's plumbing, I cannot see them going to the additional trouble and
> expense of changing out the entire exhaust manifold.
>
> I purchased a new 1978 GMC heavy half ton pickup with a 350 gas engine
> that has no emission controls at all. No air pump, no catalytic conv., no
> EGR. It does have a preheat air cleaner and a coolant temperature switch
> for the distributor vacuum advance.
>
> Lee Richardson
> Evansville, Indiana
>
>
>>
>> Somebody modified something I would guess. The thermactor(sp?) system
>> (the air pump) was added in ~1975 and as far as I know was present on
>> the 6cylinder for the rest of its run (to ~1984). I haven't seen a 75 or
>> later one in a junk yard that didn't have it. Either someone removed
>> it and replaced the manifold with an earlier one or swapped the engine
>> for an earlier one. Sadly, my 1978 shop manual does not have a picture
>> of the exhaust manifold side of the engine.
>>
>>
>>
>
>

In article >, Lee Richardson wrote:

>Chances are it is original.
>While I am not at all familiar with Ford products, I do know that back in
>that era 49 state trucks over about 6000 pounds GVW were exempt from
>emission controls, and were designed to be operated on leaded or unleaded
>fuel.

He's driving a '79 fairmont with a 250cid 6. Ford truck sixes are the
230 and 300 and a different engine family.

The '78 fairmont my parents had, had an airpump. The '82? mustang the
neighbor kid had, had an airpump. Every '75 and up ford small six I've
seen in the junkyard has had an airpump. My '75 maverick with a 200cid 6
had an airpump. My'73 maverick does not have an airpump, the change was
in 74 or 75. The picture in the '78 shop manual shows the airpump, but
it's a picture from the driver's side so only the pump itself is
visible.

>So while I can see someone going to the trouble to remove an air pump and
>all it's plumbing, I cannot see them going to the additional trouble and
>expense of changing out the entire exhaust manifold.

If you have an old manifold laying around it's cheaper and maybe
even easier than screwing around with plugging the lines. Having worked
on these engines with and without the thermactor system, removing it
entirely and replacing the manifold is the best solution. The damn
thing is always in the way. It blocks access to the front and much
of both sides of the engine.

> He's driving a '79 fairmont with a 250cid 6. Ford truck sixes are the
> 230 and 300 and a different engine family.
>
> The '78 fairmont my parents had, had an airpump. The '82? mustang the
> neighbor kid had, had an airpump. Every '75 and up ford small six I've
> seen in the junkyard has had an airpump. My '75 maverick with a 200cid 6
> had an airpump. My'73 maverick does not have an airpump, the change was
> in 74 or 75.

What I have is a '79 Granada 250ci.
I should have mentioned that the new OEM exhaust
manifold is tagged to be for a '75 Granada 250ci.
It's official part # is D5DE-9430-CA.
I wonder if the CA means california version which
seems to me would have a higher emissions standard.

B.

I finally plugged the manifold ports because I'm
installing it tomorrow.

The best I could find to plug the emissions holes
were tractor wheel lug bolts at Tractor Supply.
They were too long so I cut them shorter.
The threads were a hair off. After 3/8" of
screwing in they would start to cross thread.
I cut them to 1/2" long and tightened them in until
they bottomed out agains the tapered head.
I used high temp threadlock also and they are
very tight and seated well.

The farthest hole to the back was different.
My old manifold has this one emissions port
which is jury-rigged plugged.
I found that a standard cast iron pipe plug
fit this very coarse thread perfectly and
I installed it into the new manifold as above.
I don't know how they'll ever come out,
but with my luck they will.

Thanks again for all the great advice. I still
can't believe I found a brand new manifold
using the recommended links.

Bubba.