Subject: Re: [TR] Valve seats

From: Don Hiscock <[email-masked]>
Date: Wed, 23 Oct 2024 10:24:48 -0600

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I=E2=80=99ve never heard that bit about satellite seats, John, but it=E2=80=
=99s certainly
possible.

My recollection is that unleaded fuel first started becoming available in
America circa 1973-75 and it became dominant in the 1980s. It=E2=80=99s har=
d to
imagine engineering changes by the British motor industry being made in the
1960s for unleaded gasoline in the USA. Later on, perhaps.

On Wednesday, October 23, 2024, John Macartney <[email-masked]>
wrote:

> Does anyone out there have documentary evidence (in the form of Service
> Bulletins issued by the factory or Leona NJ) that makes specific mention =
of
> the introduction of stellite valve seats in place of earlier and softer
> alternatives? I do recall BMC making something of a hoo-haa about stellit=
e
> seats being used in the MGB and Healey 3000 back in the sixties. Same
> applied to Rootes Group and Jaguar.
> There is hearsay in the UK that hardened seats went into heads for the US
> market at about the same time because of the introduction of unleaded fue=
l.
> That hearsay also suggests hardened seats were territory specific but fro=
m
> an ease of production standpoint, having two different types of seat duri=
ng
> machining and manufacture just doesn=E2=80=99t make sense. I can think of=
 other
> examples where Standard-Triumph adopted a =E2=80=9Cone type fits all=E2=
=80=9D applied and
> that goes for other British makes.
> It=E2=80=99s clear that valve seat recession fears in Europe has been a k=
neejerk
> reaction to a problem that never really existed which suggests stellite
> valve seats were fitted for all markets. An engineering or service bullet=
in
> back in the day would have confirmed this but I never remember seeing one=
.
> Thoughts anyone?
>
> Jonmac
> ** [email-masked] **
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/pipermail/triumphs
> http://www.team.net/archive
>
> Unsubscribe/Manage: http://autox.team.net/mailman/
> options/triumphs/[email-masked]
>

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I=E2=80=99ve never heard that bit about satellite seats, John, but it=E2=80=
=99s certainly possible.=C2=A0<div><br></div><div>My recollection is that u=
nleaded fuel first started becoming available in America circa 1973-75 and =
it became dominant in the 1980s. It=E2=80=99s hard to imagine engineering c=
hanges by the British motor industry being made in the 1960s for unleaded g=
asoline in the USA. Later on, perhaps.=C2=A0<br><br>On Wednesday, October 2=
3, 2024, John Macartney &lt;<a href=3D"mailto:[email-masked]">johnb=
[email-masked]</a>&gt; wrote:<br><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Does any=
one out there have documentary evidence (in the form of Service Bulletins i=
ssued by the factory or Leona NJ) that makes specific mention of the introd=
uction of stellite valve seats in place of earlier and softer alternatives?=
 I do recall BMC making something of a hoo-haa about stellite seats being u=
sed in the MGB and Healey 3000 back in the sixties. Same applied to Rootes =
Group and Jaguar.<br>
There is hearsay in the UK that hardened seats went into heads for the US m=
arket at about the same time because of the introduction of unleaded fuel. =
That hearsay also suggests hardened seats were territory specific but from =
an ease of production standpoint, having two different types of seat during=
 machining and manufacture just doesn=E2=80=99t make sense. I can think of =
other examples where Standard-Triumph adopted a =E2=80=9Cone type fits all=
=E2=80=9D applied and that goes for other British makes.<br>
It=E2=80=99s clear that valve seat recession fears in Europe has been a kne=
ejerk reaction to a problem that never really existed which suggests stelli=
te valve seats were fitted for all markets. An engineering or service bulle=
tin back in the day would have confirmed this but I never remember seeing o=
ne. Thoughts anyone?<br>
<br>
Jonmac<br>
** <a href=3D"mailto:[email-masked]">[email-masked]</a> *=
*<br>
<br>
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wbr>options/triumphs/don.hiscock@<wbr>gmail.com</a><br>
</blockquote></div>

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** [email-masked] **

Archive: http://www.team.net/pipermail/triumphs  http://www.team.net/archive

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---

From: Greg Lemon <[email-masked]>
Date: Wed, 23 Oct 2024 12:32:21 -0500

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I never heard about the adoption of hardened valve seats early on for
Triumph or other imports.  Word on the street in the 80s was we needed to
get hardened valve seats, find leaded fuel, or run an additive in our fuel
for our sixties and early seventies cast iron head  British cars.

I remember using some kind of lead additive/octane booster in my daily
drivers at that time, don't know if it made any difference.

Since then I have had many hobby cars and many thousands of miles of use
with no lead or additives and no problems.

Greg Lemon
68 TR250

On Wed, Oct 23, 2024, 11:36=E2=80=AFAM Don Hiscock <[email-masked]> =
wrote:

> I=E2=80=99ve never heard that bit about satellite seats, John, but it=E2=
=80=99s certainly
> America circa 1973-75 and it became dominant in the 1980s. It=E2=80=99s h=
ard to
> imagine engineering changes by the British motor industry being made in t=
he
>> Bulletins issued by the factory or Leona NJ) that makes specific mention=
 of
>> alternatives? I do recall BMC making something of a hoo-haa about stelli=
te
>> There is hearsay in the UK that hardened seats went into heads for the U=
S
>> market at about the same time because of the introduction of unleaded fu=
el.
>> That hearsay also suggests hardened seats were territory specific but fr=
om
>> an ease of production standpoint, having two different types of seat dur=
ing
>> machining and manufacture just doesn=E2=80=99t make sense. I can think o=
f other
=80=9D applied and
>> It=E2=80=99s clear that valve seat recession fears in Europe has been a =
kneejerk
>> valve seats were fitted for all markets. An engineering or service bulle=
tin
>> back in the day would have confirmed this but I never remember seeing on=
e.
>> Unsubscribe/Manage:
>> http://autox.team.net/mailman/options/triumphs/[email-masked]
>>
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/triumphs/[email-masked]
>

--0000000000005da7300625284553
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<div dir=3D"auto">I never heard about the adoption of hardened valve seats =
early on for Triumph or other imports.=C2=A0 Word on the street in the 80s =
was we needed to get hardened valve seats, find leaded fuel, or run an addi=
tive in our fuel for our sixties and early seventies cast iron head=C2=A0 B=
ritish cars.=C2=A0=C2=A0<div dir=3D"auto"><br></div><div dir=3D"auto">I rem=
ember using some kind of lead additive/octane booster in my daily drivers a=
t that time, don&#39;t know if it made any difference.=C2=A0=C2=A0</div><di=
v dir=3D"auto"><br></div><div dir=3D"auto">Since then I have had many hobby=
 cars and many thousands of miles of use with no lead or additives and no p=
roblems.</div><div dir=3D"auto"><br></div><div dir=3D"auto">Greg Lemon</div=
><div dir=3D"auto">68 TR250</div></div><br><div class=3D"gmail_quote"><div =
dir=3D"ltr" class=3D"gmail_attr">On Wed, Oct 23, 2024, 11:36=E2=80=AFAM Don=
 Hiscock &lt;<a href=3D"mailto:[email-masked]">[email-masked]=
</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:=
0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I=E2=80=99ve never =
heard that bit about satellite seats, John, but it=E2=80=99s certainly poss=
ible.=C2=A0<div><br></div><div>My recollection is that unleaded fuel first =
started becoming available in America circa 1973-75 and it became dominant =
in the 1980s. It=E2=80=99s hard to imagine engineering changes by the Briti=
sh motor industry being made in the 1960s for unleaded gasoline in the USA.=
 Later on, perhaps.=C2=A0<br><br>On Wednesday, October 23, 2024, John Macar=
tney &lt;<a href=3D"mailto:[email-masked]" target=3D"_blank" rel=3D=
"noreferrer">[email-masked]</a>&gt; wrote:<br><blockquote class=3D"=
gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-=
left:1ex">Does anyone out there have documentary evidence (in the form of S=
ervice Bulletins issued by the factory or Leona NJ) that makes specific men=
tion of the introduction of stellite valve seats in place of earlier and so=
fter alternatives? I do recall BMC making something of a hoo-haa about stel=
lite seats being used in the MGB and Healey 3000 back in the sixties. Same =
applied to Rootes Group and Jaguar.<br>
There is hearsay in the UK that hardened seats went into heads for the US m=
arket at about the same time because of the introduction of unleaded fuel. =
That hearsay also suggests hardened seats were territory specific but from =
an ease of production standpoint, having two different types of seat during=
 machining and manufacture just doesn=E2=80=99t make sense. I can think of =
other examples where Standard-Triumph adopted a =E2=80=9Cone type fits all=
=E2=80=9D applied and that goes for other British makes.<br>
It=E2=80=99s clear that valve seat recession fears in Europe has been a kne=
ejerk reaction to a problem that never really existed which suggests stelli=
te valve seats were fitted for all markets. An engineering or service bulle=
tin back in the day would have confirmed this but I never remember seeing o=
ne. Thoughts anyone?<br>
<br>
Jonmac<br>
** <a href=3D"mailto:[email-masked]" target=3D"_blank" rel=3D"nore=
ferrer">[email-masked]</a> **<br>
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=3D"noreferrer">http://www.team.net/donate.html</a><br>
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ref=3D"http://www.team.net/archive" target=3D"_blank" rel=3D"noreferrer">ht=
tp://www.team.net/archive</a><br>
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hs/[email-masked]" target=3D"_blank" rel=3D"noreferrer">http://autox=
.team.net/mailman/options/triumphs/[email-masked]</a><br>
</blockquote></div>
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From: <[email-masked]>
Date: Wed, 23 Oct 2024 21:15:57 +0000 (UTC)

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I also thought that I did not need hardened valve seats in my 1966 TR4A wit=
h only 24,000 original miles. However, after a 5 hour run at a steady 75 to=
 85 miles an hour, my exhaust valves receded 0.005" to .006". I am using Sh=
ell 90 Octane non ethanol gasoline. So, I removed the head, and had hardene=
d seats installed. I also used the opportunity to replace and seal the push=
 rod tubes, since they were badly leaking.
=C2=A0My 1959 TR3A got hardened valve seats as part of its complete restora=
tion two years ago.=C2=A0Alex Levy59 TR3A66 TR4A=C2=A0=C2=A0
In a message dated 10/23/2024 2:10:31 PM Eastern Daylight Time, grglmn@gmai=
l.com writes:=C2=A0
I never heard about the adoption of hardened valve seats early on for Trium=
ph or other imports.=C2=A0 Word on the street in the 80s was we needed to g=
et hardened valve seats, find leaded fuel, or run an additive in our fuel f=
or our sixties and early seventies cast iron head=C2=A0 British cars.=C2=A0=
=C2=A0=C2=A0I remember using some kind of lead additive/octane booster in m=
y daily drivers at that time, don't know if it made any difference.=C2=A0=
=C2=A0=C2=A0Since then I have had many hobby cars and many thousands of mil=
es of use with no lead or additives and no problems.=C2=A0Greg Lemon68 TR25=
0
On Wed, Oct 23, 2024, 11:36=E2=80=AFAM Don Hiscock <[email-masked]> =
wrote:
I=E2=80=99ve never heard that bit about satellite seats, John, but it=E2=80=
=99s certainly possible.=C2=A0=C2=A0My recollection is that unleaded fuel f=
irst started becoming available in America circa 1973-75 and it became domi=
nant in the 1980s. It=E2=80=99s hard to imagine engineering changes by the =
British motor industry being made in the 1960s for unleaded gasoline in the=
 USA. Later on, perhaps.=C2=A0

On Wednesday, October 23, 2024, John Macartney <[email-masked]> wro=
te:

Does anyone out there have documentary evidence (in the form of Service Bul=
letins issued by the factory or Leona NJ) that makes specific mention of th=
e introduction of stellite valve seats in place of earlier and softer alter=
natives? I do recall BMC making something of a hoo-haa about stellite seats=
 being used in the MGB and Healey 3000 back in the sixties. Same applied to=
 Rootes Group and Jaguar.
There is hearsay in the UK that hardened seats went into heads for the US m=
arket at about the same time because of the introduction of unleaded fuel. =
That hearsay also suggests hardened seats were territory specific but from =
an ease of production standpoint, having two different types of seat during=
 machining and manufacture just doesn=E2=80=99t make sense. I can think of =
other examples where Standard-Triumph adopted a =E2=80=9Cone type fits all=
=E2=80=9D applied and that goes for other British makes.
It=E2=80=99s clear that valve seat recession fears in Europe has been a kne=
ejerk reaction to a problem that never really existed which suggests stelli=
te valve seats were fitted for all markets. An engineering or service bulle=
tin back in the day would have confirmed this but I never remember seeing o=
ne. Thoughts anyone?

Jonmac

Archive: http://www.team.net/pipermail/triumphs=C2=A0 http://www.team.net/a=
rchive

[email-masked]

Archive: http://www.team.net/pipermail/triumphs=C2=A0 http://www.team.net/a=
rchive

ail.com

Archive: http://www.team.net/pipermail/triumphs=C2=A0 http://www.team.net/a=
rchive

ol.com

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<div>
<div class=3D"userEdit" style=3D"font-family: arial, helvetica, sans-serif;=
 font-size: 10pt; color: rgb(0, 0, 0);"><span style=3D"color: rgb(0, 0, 0);=
 font-style: normal; font-weight: normal;">I also thought that I did not ne=
ed hardened valve seats in my 1966 TR4A with only 24,000 original miles. Ho=
wever, after a 5 hour run at a steady 75 to 85 miles an hour, my exhaust va=
lves receded 0.005" to .006". I am using Shell 90 Octane non ethanol gasoli=
ne. So, I removed the head, and had hardened seats installed. I also used t=
he opportunity to replace and seal the push rod tubes, since they were badl=
y leaking.<br></span></div>
<div class=3D"userEdit" style=3D"font-family: arial, helvetica, sans-serif;=
 font-size: 10pt; color: rgb(0, 0, 0);">&nbsp;</div>
<div class=3D"userEdit" style=3D"font-family: arial, helvetica, sans-serif;=
 font-size: 10pt; color: rgb(0, 0, 0);"><span style=3D"color: rgb(0, 0, 0);=
 font-style: normal; font-weight: normal;">My 1959 TR3A got hardened valve =
seats as part of its complete restoration two years ago.</span></div>
<div class=3D"userEdit" style=3D"font-family: arial, helvetica, sans-serif;=
 font-size: 10pt; color: rgb(0, 0, 0);">&nbsp;</div>
<div class=3D"userEdit" style=3D"font-family: arial, helvetica, sans-serif;=
 font-size: 10pt; color: rgb(0, 0, 0);"><span style=3D"color: rgb(0, 0, 0);=
 font-style: normal; font-weight: normal;">Alex Levy</span></div>
<div class=3D"userEdit" style=3D"font-family: arial, helvetica, sans-serif;=
 font-size: 10pt; color: rgb(0, 0, 0);"><span style=3D"color: rgb(0, 0, 0);=
 font-style: normal; font-weight: normal;">59 TR3A</span></div>
<div class=3D"userEdit" style=3D"font-family: arial, helvetica, sans-serif;=
 font-size: 10pt; color: rgb(0, 0, 0);"><span style=3D"color: rgb(0, 0, 0);=
 font-style: normal; font-weight: normal;">66 TR4A</span></div>
<div class=3D"userEdit" style=3D"font-family: arial, helvetica, sans-serif;=
 font-size: 10pt; color: rgb(0, 0, 0);">&nbsp;</div>
<div class=3D"userEdit" style=3D"font-family: arial, helvetica, sans-serif;=
 font-size: 10pt; color: rgb(0, 0, 0);">&nbsp;</div>
<br>In a message dated 10/23/2024 2:10:31 PM Eastern Daylight Time, grglmn@=
gmail.com writes:
<div>&nbsp;</div>
<div class=3D"quotedReply">
<blockquote style=3D"padding-left: 5px; margin-left: 5px; border-left: blue=
 2px solid;">
<div id=3D"yiv5020355293">
<div>
<div>I never heard about the adoption of hardened valve seats early on for =
Triumph or other imports.&nbsp; Word on the street in the 80s was we needed=
 to get hardened valve seats, find leaded fuel, or run an additive in our f=
uel for our sixties and early seventies cast iron head&nbsp; British cars.&=
nbsp;&nbsp;
<div>&nbsp;</div>
<div>I remember using some kind of lead additive/octane booster in my daily=
 drivers at that time, don't know if it made any difference.&nbsp;&nbsp;</d=
iv>
<div>&nbsp;</div>
<div>Since then I have had many hobby cars and many thousands of miles of u=
se with no lead or additives and no problems.</div>
<div>&nbsp;</div>
<div>Greg Lemon</div>
<div>68 TR250</div>
</div>
<br clear=3D"none">
<div class=3D"yiv5020355293gmail_quote">
<div id=3D"yiv5020355293yqtfd11421" class=3D"yiv5020355293yqt1271817098">
<div class=3D"yiv5020355293gmail_attr" dir=3D"ltr">On Wed, Oct 23, 2024, 11=
:36=E2=80=AFAM Don Hiscock &lt;<a href=3D"mailto:[email-masked]" tar=
get=3D"_blank" rel=3D"nofollow noopener noreferrer" shape=3D"rect">don.hisc=
[email-masked]</a>&gt; wrote:</div>
</div>
<blockquote class=3D"yiv5020355293gmail_quote" style=3D"margin: 0 0 0 .8ex;=
 border-left: 1px #ccc solid; padding-left: 1ex;">
<div id=3D"yiv5020355293yqtfd47055" class=3D"yiv5020355293yqt1271817098">I&=
rsquo;ve never heard that bit about satellite seats, John, but it&rsquo;s c=
ertainly possible.&nbsp;
<div>&nbsp;</div>
<div>My recollection is that unleaded fuel first started becoming available=
 in America circa 1973-75 and it became dominant in the 1980s. It&rsquo;s h=
ard to imagine engineering changes by the British motor industry being made=
 in the 1960s for unleaded gasoline in the USA. Later on, perhaps.&nbsp;<br=
 clear=3D"none"><br clear=3D"none">On Wednesday, October 23, 2024, John Mac=
artney &lt;<a href=3D"mailto:[email-masked]" target=3D"_blank" rel=
=3D"nofollow noopener noreferrer" shape=3D"rect">[email-masked]</a>=
&gt; wrote:<br clear=3D"none">
<blockquote class=3D"yiv5020355293gmail_quote" style=3D"margin: 0 0 0 .8ex;=
 border-left: 1px #ccc solid; padding-left: 1ex;">Does anyone out there hav=
e documentary evidence (in the form of Service Bulletins issued by the fact=
ory or Leona NJ) that makes specific mention of the introduction of stellit=
e valve seats in place of earlier and softer alternatives? I do recall BMC =
making something of a hoo-haa about stellite seats being used in the MGB an=
d Healey 3000 back in the sixties. Same applied to Rootes Group and Jaguar.=
<br clear=3D"none">There is hearsay in the UK that hardened seats went into=
 heads for the US market at about the same time because of the introduction=
 of unleaded fuel. That hearsay also suggests hardened seats were territory=
 specific but from an ease of production standpoint, having two different t=
ypes of seat during machining and manufacture just doesn&rsquo;t make sense=
. I can think of other examples where Standard-Triumph adopted a &ldquo;one=
 type fits all&rdquo; applied and that goes for other British makes.<br cle=
ar=3D"none">It&rsquo;s clear that valve seat recession fears in Europe has =
been a kneejerk reaction to a problem that never really existed which sugge=
sts stellite valve seats were fitted for all markets. An engineering or ser=
vice bulletin back in the day would have confirmed this but I never remembe=
r seeing one. Thoughts anyone?<br clear=3D"none"><br clear=3D"none">Jonmac<=
br clear=3D"none">** <a href=3D"mailto:[email-masked]" target=3D"_=
blank" rel=3D"nofollow noopener noreferrer" shape=3D"rect">[email-masked]=
eam.net</a> **<br clear=3D"none"><br clear=3D"none">Donate: <a href=3D"http=
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From: John Macartney <[email-masked]>
Date: Thu, 24 Oct 2024 11:02:37 +0100

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Don, Interesting about the dates for the intro of unleaded fuel. I remember a=
t the end of my Apprenticeship at Jaguar in 1966 being asked by American own=
ers collecting their new E Types about fuel options while travelling in Euro=
pe. Should it be leaded or unleaded? I=E2=80=99d never heard of unleaded up t=
o that point, so usually said =E2=80=9C use any brand with =E2=80=9Csuper=E2=
=80=9D in its name as it will be between 99 and 105 octane RM=E2=80=9D. As C=
alifornia seemed to have the lions share of pollution, did unleaded start th=
ere and slowly spread across the country?=20
But back in that time, I clearly remember the many processes in assembling t=
he XK engine. Inlet valve seats were a dull but clean steel colour while the=
 exhaust seats were a very dark brown, while cutting the seat face was done f=
ar slower for the exhaust than for the inlet.
Do wish I=E2=80=99d paid more attention at the time and asked =E2=80=9Cwhy?=E2=
=80=9D a lot more than I did. Just can=E2=80=99t remember things as clearly a=
s years ago.

Jonmac

> On 23 Oct 2024, at 17:24, Don Hiscock <[email-masked]> wrote:
>=20
=99s certainly possible.=20
>=20
> My recollection is that unleaded fuel first started becoming available in A=
merica circa 1973-75 and it became dominant in the 1980s. It=E2=80=99s hard t=
o imagine engineering changes by the British motor industry being made in th=
e 1960s for unleaded gasoline in the USA. Later on, perhaps.=20
>=20
>> On Wednesday, October 23, 2024, John Macartney <[email-masked]> w=
rote:
>> Does anyone out there have documentary evidence (in the form of Service B=
ulletins issued by the factory or Leona NJ) that makes specific mention of t=
he introduction of stellite valve seats in place of earlier and softer alter=
natives? I do recall BMC making something of a hoo-haa about stellite seats b=
eing used in the MGB and Healey 3000 back in the sixties. Same applied to Ro=
otes Group and Jaguar.
>> There is hearsay in the UK that hardened seats went into heads for the US=
 market at about the same time because of the introduction of unleaded fuel.=
 That hearsay also suggests hardened seats were territory specific but from a=
n ease of production standpoint, having two different types of seat during m=
achining and manufacture just doesn=E2=80=99t make sense. I can think of oth=
er examples where Standard-Triumph adopted a =E2=80=9Cone type fits all=E2=80=
=9D applied and that goes for other British makes.
>> It=E2=80=99s clear that valve seat recession fears in Europe has been a k=
neejerk reaction to a problem that never really existed which suggests stell=
ite valve seats were fitted for all markets. An engineering or service bulle=
tin back in the day would have confirmed this but I never remember seeing on=
e. Thoughts anyone?
>>=20
>>=20
>> Archive: http://www.team.net/pipermail/triumphs  http://www.team.net/arch=
ive
>>=20
>> Unsubscribe/Manage: http://autox.team.net/mailman/options/triumphs/don.hi=
[email-masked]

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div dir=3D"ltr"></div><div dir=3D"ltr">Don=
, Interesting about the dates for the intro of unleaded fuel. I remember at t=
he end of my Apprenticeship at Jaguar in 1966 being asked by American owners=
 collecting their new E Types about fuel options while travelling in Europe.=
 Should it be leaded or unleaded? I=E2=80=99d never heard of unleaded up to t=
hat point, so usually said =E2=80=9C use any brand with =E2=80=9Csuper=E2=80=
=9D in its name as it will be between 99 and 105 octane RM=E2=80=9D. As Cali=
fornia seemed to have the lions share of pollution, did unleaded start there=
 and slowly spread across the country?&nbsp;</div><div dir=3D"ltr">But back i=
n that time, I clearly remember the many processes in assembling the XK engi=
ne. Inlet valve seats were a dull but clean steel colour while the exhaust s=
eats were a very dark brown, while cutting the seat face was done far slower=
 for the exhaust than for the inlet.</div><div dir=3D"ltr">Do wish I=E2=80=99=
d paid more attention at the time and asked =E2=80=9Cwhy?=E2=80=9D a lot mor=
e than I did. Just can=E2=80=99t remember things as clearly as years ago.</d=
iv><div dir=3D"ltr"><br></div><div dir=3D"ltr">Jonmac</div><div dir=3D"ltr">=
<br>On 23 Oct 2024, at 17:24, Don Hiscock &lt;<a href=3D"mailto:don.hiscock@=
gmail.com">[email-masked]</a>&gt; wrote:<br><br></div><blockquote typ=
e=3D"cite"><div dir=3D"ltr">I=E2=80=99ve never heard that bit about satellit=
e seats, John, but it=E2=80=99s certainly possible.&nbsp;<div><br></div><div=
>My recollection is that unleaded fuel first started becoming available in A=
merica circa 1973-75 and it became dominant in the 1980s. It=E2=80=99s hard t=
o imagine engineering changes by the British motor industry being made in th=
e 1960s for unleaded gasoline in the USA. Later on, perhaps.&nbsp;<br><br>On=
 Wednesday, October 23, 2024, John Macartney &lt;<a href=3D"mailto:johnbmaca=
[email-masked]">[email-masked]</a>&gt; wrote:<br><blockquote class=3D=
"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-=
left:1ex">Does anyone out there have documentary evidence (in the form of Se=
rvice Bulletins issued by the factory or Leona NJ) that makes specific menti=
on of the introduction of stellite valve seats in place of earlier and softe=
r alternatives? I do recall BMC making something of a hoo-haa about stellite=
 seats being used in the MGB and Healey 3000 back in the sixties. Same appli=
ed to Rootes Group and Jaguar.<br>
There is hearsay in the UK that hardened seats went into heads for the US ma=
rket at about the same time because of the introduction of unleaded fuel. Th=
at hearsay also suggests hardened seats were territory specific but from an e=
ase of production standpoint, having two different types of seat during mach=
ining and manufacture just doesn=E2=80=99t make sense. I can think of other e=
xamples where Standard-Triumph adopted a =E2=80=9Cone type fits all=E2=80=9D=
 applied and that goes for other British makes.<br>
It=E2=80=99s clear that valve seat recession fears in Europe has been a knee=
jerk reaction to a problem that never really existed which suggests stellite=
 valve seats were fitted for all markets. An engineering or service bulletin=
 back in the day would have confirmed this but I never remember seeing one. T=
houghts anyone?<br>
<br>
Jonmac<br>
** <a href=3D"mailto:[email-masked]">[email-masked]</a> **=
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