See link.

http://www.allpar.com/mopar/new-mopar-hemi.html

There's a quote half way down, copied here for your convenience:

"...There is also a little problem called "flame quench" (which causes
additional NOx) with a true Hemi design, as was used on the V16 aircraft
engine and the automotive engines produced in the 1950s. Today's Hemi is
that (a "Hemi") in name only. [Editor's note: Bob is referring to the head
design. It is not a true hemispherical head, but looks vaguely like a
hemispherical head with parts filled in.]"

Here's a nice photo of the new head and the oval or squished in "Hemi."

http://www.popularhotrodding.com/tech/0403phr_hemi/

These pages have a lot of other good info.

-John

"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:4121819A.79839FC2@***.net...
> Look at how the chambers look on an old 426 Hemi:
> http://www.thehemi.com/notable.php?id=005 Then tell how you may
> "squished in on the sides". Especially when it says it is a "Aluminum
> cast true-Hemi cylinder heads":
> http://www.thehemi.com/news.php?id=20020531-1
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Generic wrote:
> >
> > Yes, I assume that was said in reference to the fact that the new "Hemi"
is
> > hemispherical on one axis and squished in on the sides. Not even
remotely
> > like the heads of the originals. Maybe it should have been called the
> > open-on-the-bottom-taco head. When it came out some criticized the
"Hemi"
> > name as pure marketing.
> >
> > -John

 

See link.

http://www.allpar.com/mopar/new-mopar-hemi.html

There's a quote half way down, copied here for your convenience:

"...There is also a little problem called "flame quench" (which causes
additional NOx) with a true Hemi design, as was used on the V16 aircraft
engine and the automotive engines produced in the 1950s. Today's Hemi is
that (a "Hemi") in name only. [Editor's note: Bob is referring to the head
design. It is not a true hemispherical head, but looks vaguely like a
hemispherical head with parts filled in.]"

Here's a nice photo of the new head and the oval or squished in "Hemi."

http://www.popularhotrodding.com/tech/0403phr_hemi/

These pages have a lot of other good info.

-John

"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:4121819A.79839FC2@***.net...
> Look at how the chambers look on an old 426 Hemi:
> http://www.thehemi.com/notable.php?id=005 Then tell how you may
> "squished in on the sides". Especially when it says it is a "Aluminum
> cast true-Hemi cylinder heads":
> http://www.thehemi.com/news.php?id=20020531-1
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Generic wrote:
> >
> > Yes, I assume that was said in reference to the fact that the new "Hemi"
is
> > hemispherical on one axis and squished in on the sides. Not even
remotely
> > like the heads of the originals. Maybe it should have been called the
> > open-on-the-bottom-taco head. When it came out some criticized the
"Hemi"
> > name as pure marketing.
> >
> > -John

 

See link.

http://www.allpar.com/mopar/new-mopar-hemi.html

There's a quote half way down, copied here for your convenience:

"...There is also a little problem called "flame quench" (which causes
additional NOx) with a true Hemi design, as was used on the V16 aircraft
engine and the automotive engines produced in the 1950s. Today's Hemi is
that (a "Hemi") in name only. [Editor's note: Bob is referring to the head
design. It is not a true hemispherical head, but looks vaguely like a
hemispherical head with parts filled in.]"

Here's a nice photo of the new head and the oval or squished in "Hemi."

http://www.popularhotrodding.com/tech/0403phr_hemi/

These pages have a lot of other good info.

-John

"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:4121819A.79839FC2@***.net...
> Look at how the chambers look on an old 426 Hemi:
> http://www.thehemi.com/notable.php?id=005 Then tell how you may
> "squished in on the sides". Especially when it says it is a "Aluminum
> cast true-Hemi cylinder heads":
> http://www.thehemi.com/news.php?id=20020531-1
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Generic wrote:
> >
> > Yes, I assume that was said in reference to the fact that the new "Hemi"
is
> > hemispherical on one axis and squished in on the sides. Not even
remotely
> > like the heads of the originals. Maybe it should have been called the
> > open-on-the-bottom-taco head. When it came out some criticized the
"Hemi"
> > name as pure marketing.
> >
> > -John

 

The picture of the chamber is using two spark plugs like for a Drag
engine. The new Hemi uses that area for the electronic injection. But,
adding a deck level areas, is a good thing, Chevy uses them, and the
Ford engines I raced, when ported. polished, relieved, and CC, that area
was left with a sharp edge, for some trick stuff that worked for me.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Generic wrote:
>
> See link.
>
> http://www.allpar.com/mopar/new-mopar-hemi.html
>
> There's a quote half way down, copied here for your convenience:
>
> "...There is also a little problem called "flame quench" (which causes
> additional NOx) with a true Hemi design, as was used on the V16 aircraft
> engine and the automotive engines produced in the 1950s. Today's Hemi is
> that (a "Hemi") in name only. [Editor's note: Bob is referring to the head
> design. It is not a true hemispherical head, but looks vaguely like a
> hemispherical head with parts filled in.]"
>
> Here's a nice photo of the new head and the oval or squished in "Hemi."
>
> http://www.popularhotrodding.com/tech/0403phr_hemi/
>
> These pages have a lot of other good info.
>
> -John

 

The picture of the chamber is using two spark plugs like for a Drag
engine. The new Hemi uses that area for the electronic injection. But,
adding a deck level areas, is a good thing, Chevy uses them, and the
Ford engines I raced, when ported. polished, relieved, and CC, that area
was left with a sharp edge, for some trick stuff that worked for me.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Generic wrote:
>
> See link.
>
> http://www.allpar.com/mopar/new-mopar-hemi.html
>
> There's a quote half way down, copied here for your convenience:
>
> "...There is also a little problem called "flame quench" (which causes
> additional NOx) with a true Hemi design, as was used on the V16 aircraft
> engine and the automotive engines produced in the 1950s. Today's Hemi is
> that (a "Hemi") in name only. [Editor's note: Bob is referring to the head
> design. It is not a true hemispherical head, but looks vaguely like a
> hemispherical head with parts filled in.]"
>
> Here's a nice photo of the new head and the oval or squished in "Hemi."
>
> http://www.popularhotrodding.com/tech/0403phr_hemi/
>
> These pages have a lot of other good info.
>
> -John

 

The picture of the chamber is using two spark plugs like for a Drag
engine. The new Hemi uses that area for the electronic injection. But,
adding a deck level areas, is a good thing, Chevy uses them, and the
Ford engines I raced, when ported. polished, relieved, and CC, that area
was left with a sharp edge, for some trick stuff that worked for me.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Generic wrote:
>
> See link.
>
> http://www.allpar.com/mopar/new-mopar-hemi.html
>
> There's a quote half way down, copied here for your convenience:
>
> "...There is also a little problem called "flame quench" (which causes
> additional NOx) with a true Hemi design, as was used on the V16 aircraft
> engine and the automotive engines produced in the 1950s. Today's Hemi is
> that (a "Hemi") in name only. [Editor's note: Bob is referring to the head
> design. It is not a true hemispherical head, but looks vaguely like a
> hemispherical head with parts filled in.]"
>
> Here's a nice photo of the new head and the oval or squished in "Hemi."
>
> http://www.popularhotrodding.com/tech/0403phr_hemi/
>
> These pages have a lot of other good info.
>
> -John

 

The picture of the chamber is using two spark plugs like for a Drag
engine. The new Hemi uses that area for the electronic injection. But,
adding a deck level areas, is a good thing, Chevy uses them, and the
Ford engines I raced, when ported. polished, relieved, and CC, that area
was left with a sharp edge, for some trick stuff that worked for me.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Generic wrote:
>
> See link.
>
> http://www.allpar.com/mopar/new-mopar-hemi.html
>
> There's a quote half way down, copied here for your convenience:
>
> "...There is also a little problem called "flame quench" (which causes
> additional NOx) with a true Hemi design, as was used on the V16 aircraft
> engine and the automotive engines produced in the 1950s. Today's Hemi is
> that (a "Hemi") in name only. [Editor's note: Bob is referring to the head
> design. It is not a true hemispherical head, but looks vaguely like a
> hemispherical head with parts filled in.]"
>
> Here's a nice photo of the new head and the oval or squished in "Hemi."
>
> http://www.popularhotrodding.com/tech/0403phr_hemi/
>
> These pages have a lot of other good info.
>
> -John

 

The two plugs are explained in the allpar.com article:

"Dual spark plugs per cylinder ensure consistent, complete and rapid
combustion, without knock, that increases peak power and torque, reduces
exhaust emissions and increases fuel efficiency. It even smoothes the
engine's idle. The 5.7 delivers an 8-10 percent better fuel efficiency than
the less-powerful 5.9."

-John



"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:412197A6.6C32E49E@***.net...
> The picture of the chamber is using two spark plugs like for a Drag
> engine. The new Hemi uses that area for the electronic injection. But,
> adding a deck level areas, is a good thing, Chevy uses them, and the
> Ford engines I raced, when ported. polished, relieved, and CC, that area
> was left with a sharp edge, for some trick stuff that worked for me.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Generic wrote:
> >
> > See link.
> >
> > http://www.allpar.com/mopar/new-mopar-hemi.html
> >
> > There's a quote half way down, copied here for your convenience:
> >
> > "...There is also a little problem called "flame quench" (which causes
> > additional NOx) with a true Hemi design, as was used on the V16 aircraft
> > engine and the automotive engines produced in the 1950s. Today's Hemi is
> > that (a "Hemi") in name only. [Editor's note: Bob is referring to the
head
> > design. It is not a true hemispherical head, but looks vaguely like a
> > hemispherical head with parts filled in.]"
> >
> > Here's a nice photo of the new head and the oval or squished in "Hemi."
> >
> > http://www.popularhotrodding.com/tech/0403phr_hemi/
> >
> > These pages have a lot of other good info.
> >
> > -John

 

The two plugs are explained in the allpar.com article:

"Dual spark plugs per cylinder ensure consistent, complete and rapid
combustion, without knock, that increases peak power and torque, reduces
exhaust emissions and increases fuel efficiency. It even smoothes the
engine's idle. The 5.7 delivers an 8-10 percent better fuel efficiency than
the less-powerful 5.9."

-John



"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:412197A6.6C32E49E@***.net...
> The picture of the chamber is using two spark plugs like for a Drag
> engine. The new Hemi uses that area for the electronic injection. But,
> adding a deck level areas, is a good thing, Chevy uses them, and the
> Ford engines I raced, when ported. polished, relieved, and CC, that area
> was left with a sharp edge, for some trick stuff that worked for me.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Generic wrote:
> >
> > See link.
> >
> > http://www.allpar.com/mopar/new-mopar-hemi.html
> >
> > There's a quote half way down, copied here for your convenience:
> >
> > "...There is also a little problem called "flame quench" (which causes
> > additional NOx) with a true Hemi design, as was used on the V16 aircraft
> > engine and the automotive engines produced in the 1950s. Today's Hemi is
> > that (a "Hemi") in name only. [Editor's note: Bob is referring to the
head
> > design. It is not a true hemispherical head, but looks vaguely like a
> > hemispherical head with parts filled in.]"
> >
> > Here's a nice photo of the new head and the oval or squished in "Hemi."
> >
> > http://www.popularhotrodding.com/tech/0403phr_hemi/
> >
> > These pages have a lot of other good info.
> >
> > -John

 

The two plugs are explained in the allpar.com article:

"Dual spark plugs per cylinder ensure consistent, complete and rapid
combustion, without knock, that increases peak power and torque, reduces
exhaust emissions and increases fuel efficiency. It even smoothes the
engine's idle. The 5.7 delivers an 8-10 percent better fuel efficiency than
the less-powerful 5.9."

-John



"L.W. (ßill) ------ III" <----------@***.net> wrote in message
news:412197A6.6C32E49E@***.net...
> The picture of the chamber is using two spark plugs like for a Drag
> engine. The new Hemi uses that area for the electronic injection. But,
> adding a deck level areas, is a good thing, Chevy uses them, and the
> Ford engines I raced, when ported. polished, relieved, and CC, that area
> was left with a sharp edge, for some trick stuff that worked for me.
> God Bless America, ßill O|||||||O
> mailto:-------------------- http://www.----------.com/
>
> Generic wrote:
> >
> > See link.
> >
> > http://www.allpar.com/mopar/new-mopar-hemi.html
> >
> > There's a quote half way down, copied here for your convenience:
> >
> > "...There is also a little problem called "flame quench" (which causes
> > additional NOx) with a true Hemi design, as was used on the V16 aircraft
> > engine and the automotive engines produced in the 1950s. Today's Hemi is
> > that (a "Hemi") in name only. [Editor's note: Bob is referring to the
head
> > design. It is not a true hemispherical head, but looks vaguely like a
> > hemispherical head with parts filled in.]"
> >
> > Here's a nice photo of the new head and the oval or squished in "Hemi."
> >
> > http://www.popularhotrodding.com/tech/0403phr_hemi/
> >
> > These pages have a lot of other good info.
> >
> > -John