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Chuck, the header tank setup I have used on GT6's and Spitfires has two
feeds to the top of the tank: One from the thermostat housing (or top of
the rad), and the other from the rear of the head as you are considering.
To encourage some circulation, the bottom of the header tank should be
plumbed to the suction side of the system: backside of water pump housing,
or the bottom of the rad.
I mostly use 1/4" lines for this, trying to somewhat limit the amount of
flow to "just enough".
Jason Sukey
JS Performance Motoring, LLC
440.984.7720
jason@jsperformancemotoring.com
www.jspmparts.com
https://www.facebook.com/JSPerformanceMotoring/
On Tue, Jan 20, 2026 at 4:13=E2=80=AFPM Chuck Gee via Fot <fot@autox.team.n=
et>
wrote:
> Hello all,
>
> In an effort to constantly improve the car, I=E2=80=99ve been looking at =
the
> cooling system on my TR4. It currently has a header tank mounted to the
> firewall that functions as the high spot in the system. This tank feeds
> the top of the radiator but doesn=E2=80=99t really circulate during opera=
tion.
> I=E2=80=99ve been thinking of plumbing the feed off of the back of the he=
ad into
> the top of the tank so that it circulates.
>
> Normally this rear head feed is plumbed to the back of the water pump. I=
n
> an exercise of overthinking, I=E2=80=99m not sure if there will be suffic=
ient
> circulation since the tank is plumbed to the radiator. Does it matter?
> What is the collective wisdom?
>
> Here are some pictures to help illustrate.
>
> Thanks,
>
> Chuck
>
>
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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>
>
>
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<div dir=3D"ltr"><div>=C2=A0 Chuck,=C2=A0 the header tank setup I have used=
on GT6's and Spitfires has two feeds to the top of the tank:=C2=A0 One=
from the thermostat housing (or top of the rad), and the other from the re=
ar of the head as you are considering.=C2=A0 To encourage some circulation,=
the bottom of the header tank should be plumbed to the suction side of the=
system:=C2=A0 backside of water pump=C2=A0housing, or the bottom of the ra=
d.<div><br></div><div>I mostly use 1/4" lines for this, trying to some=
what limit the amount of flow to "just enough".</div></div><div><=
br></div><div><br></div><div><br></div><div><br></div><div><br></div><div><=
div dir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"gmail_signature=
"><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div dir=3D"=
ltr"><div dir=3D"ltr"><div>Jason Sukey</div><div><span></span><span></span>=
JS Performance Motoring, LLC<br></div><div>440.984.7720</div><div><a href=
=3D"mailto:jason@jsperformancemotoring.com"; target=3D"_blank">jason@jsperfo=
rmancemotoring.com</a><br></div><div><a href=3D"http://www.jspmparts.com"; t=
arget=3D"_blank">www.jspmparts.com</a></div><div><a href=3D"https://www.fac=
ebook.com/JSPerformanceMotoring/" target=3D"_blank">https://www.facebook.co=
m/JSPerformanceMotoring/</a><br></div></div></div></div></div></div></div><=
/div></div></div><br></div><br><div class=3D"gmail_quote gmail_quote_contai=
ner"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Jan 20, 2026 at 4:13=E2=
=80=AFPM Chuck Gee via Fot <<a href=3D"mailto:fot@autox.team.net";>fot@au=
tox.team.net</a>> wrote:<br></div><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddin=
g-left:1ex">Hello all,<br>
<br>
In an effort to constantly improve the car, I=E2=80=99ve been looking at th=
e cooling system on my TR4.=C2=A0 It currently has a header tank mounted to=
the firewall that functions as the high spot in the system.=C2=A0 This tan=
k feeds the top of the radiator but doesn=E2=80=99t really circulate during=
operation.=C2=A0 I=E2=80=99ve been thinking of plumbing the feed off of th=
e back of the head into the top of the tank so that it circulates.=C2=A0 <b=
r>
<br>
Normally this rear head feed is plumbed to the back of the water pump.=C2=
=A0 In an exercise of overthinking, I=E2=80=99m not sure if there will be s=
ufficient circulation since the tank is plumbed to the radiator.=C2=A0 Does=
it matter?=C2=A0 What is the collective wisdom?<br>
<br>
Here are some pictures to help illustrate.<br>
<br>
Thanks,<br>
<br>
Chuck<br>
<br>
<br>
_______________________________________________<br>
<a href=3D"mailto:fot@autox.team.net"; target=3D"_blank">fot@autox.team.net<=
/a><br>
<br>
<a href=3D"http://www.fot-racing.com"; rel=3D"noreferrer" target=3D"_blank">=
http://www.fot-racing.com</a><br>
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et=3D"_blank">http://www.team.net/donate.html</a><br>
Archive: <a href=3D"http://autox.team.net/archive"; rel=3D"noreferrer" targe=
t=3D"_blank">http://autox.team.net/archive</a> <a href=3D"http://www.team.n=
et/pipermail/fotUnsubscribe/Manage" rel=3D"noreferrer" target=3D"_blank">ht=
tp://www.team.net/pipermail/fot<br>
t/jason@jsperformancemotoring.com" rel=3D"noreferrer" target=3D"_blank">htt=
p://autox.team.net/mailman/options/fot/jason@jsperformancemotoring.com</a><=
br>
<br>
<br>
</blockquote></div>
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