I understand that in 79 is when they added smog controls to the 304 in CJ's
and in 80 even more so. How can a non-engine-expert like me tell the
difference visually between 78, 79, and 80 304's? What exactly did they
add/remove/change? And if there is no easy way to tell, what is the hard
way? Any diagrams around? What do these "smog controls" look like?

--
"What we need are a couple of good hangings" - FTC Chairman Orson Swindle,
regarding email spam

 

Hi Jay,
When AMC introduced the 304" in '72 it was loaded with everything,
air pump and exhaust injection, intake fresh air gulp valve, exhaust
recycling valve, retarded spark, low duration retarded cam, and teeny
carburetor, and by '75 it had the catalytic convert. Unless you know
someone that'll SMOG a lawn mower, I'd pass. But if your glutton for
punishment I'll walk you through it.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Jay Stuler wrote:
>
> I understand that in 79 is when they added smog controls to the 304 in CJ's
> and in 80 even more so. How can a non-engine-expert like me tell the
> difference visually between 78, 79, and 80 304's? What exactly did they
> add/remove/change? And if there is no easy way to tell, what is the hard
> way? Any diagrams around? What do these "smog controls" look like?
>
> --
> "What we need are a couple of good hangings" - FTC Chairman Orson Swindle,
> regarding email spam

 

Hi Jay,
When AMC introduced the 304" in '72 it was loaded with everything,
air pump and exhaust injection, intake fresh air gulp valve, exhaust
recycling valve, retarded spark, low duration retarded cam, and teeny
carburetor, and by '75 it had the catalytic convert. Unless you know
someone that'll SMOG a lawn mower, I'd pass. But if your glutton for
punishment I'll walk you through it.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Jay Stuler wrote:
>
> I understand that in 79 is when they added smog controls to the 304 in CJ's
> and in 80 even more so. How can a non-engine-expert like me tell the
> difference visually between 78, 79, and 80 304's? What exactly did they
> add/remove/change? And if there is no easy way to tell, what is the hard
> way? Any diagrams around? What do these "smog controls" look like?
>
> --
> "What we need are a couple of good hangings" - FTC Chairman Orson Swindle,
> regarding email spam

 

Hi Jay,
When AMC introduced the 304" in '72 it was loaded with everything,
air pump and exhaust injection, intake fresh air gulp valve, exhaust
recycling valve, retarded spark, low duration retarded cam, and teeny
carburetor, and by '75 it had the catalytic convert. Unless you know
someone that'll SMOG a lawn mower, I'd pass. But if your glutton for
punishment I'll walk you through it.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Jay Stuler wrote:
>
> I understand that in 79 is when they added smog controls to the 304 in CJ's
> and in 80 even more so. How can a non-engine-expert like me tell the
> difference visually between 78, 79, and 80 304's? What exactly did they
> add/remove/change? And if there is no easy way to tell, what is the hard
> way? Any diagrams around? What do these "smog controls" look like?
>
> --
> "What we need are a couple of good hangings" - FTC Chairman Orson Swindle,
> regarding email spam

 

"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:3FA9EF74.C4E3C14F@***.net...
>
> Jay Stuler wrote:
> >
> > I understand that in 79 is when they added smog controls to the 304 in
CJ's
> > and in 80 even more so. How can a non-engine-expert like me tell the
> > difference visually between 78, 79, and 80 304's? What exactly did they
> > add/remove/change? And if there is no easy way to tell, what is the
hard
> > way? Any diagrams around? What do these "smog controls" look like?
> >
> Hi Jay,
> When AMC introduced the 304" in '72 it was loaded with everything,
> air pump and exhaust injection, intake fresh air gulp valve, exhaust
> recycling valve, retarded spark, low duration retarded cam, and teeny
> carburetor, and by '75 it had the catalytic convert. Unless you know
> someone that'll SMOG a lawn mower, I'd pass. But if your glutton for
> punishment I'll walk you through it.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/

If it's complicated then I don't need to know all the details, but I just
wondered the easiest way I can tell the difference between years just by
looking. Of course anyone can add/remove a catalytic converter but I'm
assuming there are some more notable characteristics to the different years
of the engine.

 

"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:3FA9EF74.C4E3C14F@***.net...
>
> Jay Stuler wrote:
> >
> > I understand that in 79 is when they added smog controls to the 304 in
CJ's
> > and in 80 even more so. How can a non-engine-expert like me tell the
> > difference visually between 78, 79, and 80 304's? What exactly did they
> > add/remove/change? And if there is no easy way to tell, what is the
hard
> > way? Any diagrams around? What do these "smog controls" look like?
> >
> Hi Jay,
> When AMC introduced the 304" in '72 it was loaded with everything,
> air pump and exhaust injection, intake fresh air gulp valve, exhaust
> recycling valve, retarded spark, low duration retarded cam, and teeny
> carburetor, and by '75 it had the catalytic convert. Unless you know
> someone that'll SMOG a lawn mower, I'd pass. But if your glutton for
> punishment I'll walk you through it.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/

If it's complicated then I don't need to know all the details, but I just
wondered the easiest way I can tell the difference between years just by
looking. Of course anyone can add/remove a catalytic converter but I'm
assuming there are some more notable characteristics to the different years
of the engine.

 

"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:3FA9EF74.C4E3C14F@***.net...
>
> Jay Stuler wrote:
> >
> > I understand that in 79 is when they added smog controls to the 304 in
CJ's
> > and in 80 even more so. How can a non-engine-expert like me tell the
> > difference visually between 78, 79, and 80 304's? What exactly did they
> > add/remove/change? And if there is no easy way to tell, what is the
hard
> > way? Any diagrams around? What do these "smog controls" look like?
> >
> Hi Jay,
> When AMC introduced the 304" in '72 it was loaded with everything,
> air pump and exhaust injection, intake fresh air gulp valve, exhaust
> recycling valve, retarded spark, low duration retarded cam, and teeny
> carburetor, and by '75 it had the catalytic convert. Unless you know
> someone that'll SMOG a lawn mower, I'd pass. But if your glutton for
> punishment I'll walk you through it.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/

If it's complicated then I don't need to know all the details, but I just
wondered the easiest way I can tell the difference between years just by
looking. Of course anyone can add/remove a catalytic converter but I'm
assuming there are some more notable characteristics to the different years
of the engine.

 

Hi Jay,
Not really, they all look alike. ;-) Really, about the only we can
tell if it still the twenty five year old 304' is to crawl under and
look at the case numbers near the motor mount to see if the usual 360 or
401 cubic inch wasn't dropped in. Usually these SMOG parts mysteriously
disappear along the way: http://www.----------.com/72CJsmog.jpg
God Bless America, ßill O|||||||O
mailto:--------------------

Jay Stuler wrote:
>
> If it's complicated then I don't need to know all the details, but I just
> wondered the easiest way I can tell the difference between years just by
> looking. Of course anyone can add/remove a catalytic converter but I'm
> assuming there are some more notable characteristics to the different years
> of the engine.

 

Hi Jay,
Not really, they all look alike. ;-) Really, about the only we can
tell if it still the twenty five year old 304' is to crawl under and
look at the case numbers near the motor mount to see if the usual 360 or
401 cubic inch wasn't dropped in. Usually these SMOG parts mysteriously
disappear along the way: http://www.----------.com/72CJsmog.jpg
God Bless America, ßill O|||||||O
mailto:--------------------

Jay Stuler wrote:
>
> If it's complicated then I don't need to know all the details, but I just
> wondered the easiest way I can tell the difference between years just by
> looking. Of course anyone can add/remove a catalytic converter but I'm
> assuming there are some more notable characteristics to the different years
> of the engine.

 

Hi Jay,
Not really, they all look alike. ;-) Really, about the only we can
tell if it still the twenty five year old 304' is to crawl under and
look at the case numbers near the motor mount to see if the usual 360 or
401 cubic inch wasn't dropped in. Usually these SMOG parts mysteriously
disappear along the way: http://www.----------.com/72CJsmog.jpg
God Bless America, ßill O|||||||O
mailto:--------------------

Jay Stuler wrote:
>
> If it's complicated then I don't need to know all the details, but I just
> wondered the easiest way I can tell the difference between years just by
> looking. Of course anyone can add/remove a catalytic converter but I'm
> assuming there are some more notable characteristics to the different years
> of the engine.