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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">I=E2=80=99m more concerned about getting fl=
ow out of the back of the head. The header tank location on my car is a=
convenient spot for me to make that work. I may just do what Phil and=
Dave Gott do and plumb that spot directly to the water pump.<div><br id=3D"=
lineBreakAtBeginningOfSignature"><div dir=3D"ltr">Chuck</div><div dir=3D"ltr=
"><br><blockquote type=3D"cite">On Jan 20, 2026, at 6:36=E2=80=AFPM, Scott J=
anzen <sjanzen@me.com> wrote:<br><br></blockquote></div><blockquote ty=
pe=3D"cite"><div dir=3D"ltr">=EF=BB=BF<meta http-equiv=3D"content-type" cont=
ent=3D"text/html; charset=3Dutf-8">I=E2=80=99ve never understood overflow ta=
nks to need =E2=80=9Cflow=E2=80=9D. Plz correct me if I=E2=80=99m wrong, but=
i thought they were there just to provide for the expansion and contraction=
of coolant when heated, etc<br id=3D"lineBreakAtBeginningOfSignature"><div d=
ir=3D"ltr">Sent from my iPhone</div><div dir=3D"ltr"><br><blockquote type=3D=
"cite">On Jan 20, 2026, at 6:31=E2=80=AFPM, vfracing--- via Fot <fot@auto=
x.team.net> wrote:<br><br></blockquote></div><blockquote type=3D"cite"><d=
iv dir=3D"ltr">=EF=BB=BF<div class=3D"ydp223f9f02yahoo-style-wrap" style=3D"=
font-family:arial;font-size:16px;"><div></div>
<div dir=3D"ltr" data-setdir=3D"false">Chuck;</div><div dir=3D"ltr" d=
ata-setdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D"false">That h=
eater core port on the back of the head provides flow to an otherwise blind s=
pot in the head over an exhaust valve. On a race car without flow thro=
ugh that port it could lead to early exhaust valve failure. The best w=
ay to ensure flow is to plumb it to the intake side of the water pump, set u=
p as if there were a heater installed. We control the flow by using a 5=
/16 line, providing some flow but not overly bypassing anything. </div=
><div dir=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D"ltr" data-setd=
ir=3D"false"> Note that blocking that flow on a street-driven engine is=
OK as the exhaust valve is not overly stressed during street driving compar=
ed to what we do on-track!</div><div dir=3D"ltr" data-setdir=3D"false"><br><=
/div><div dir=3D"ltr" data-setdir=3D"false">Hope this helps.</div><div dir=3D=
"ltr" data-setdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D"false"=
>Phil</div><div dir=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D"ltr"=
data-setdir=3D"false"><br></div><div><br></div>
=20
</div><div id=3D"yahoo_quoted_9332275551" class=3D"yahoo_quoted"><di=
v class=3D"yahoo-style-wrap" style=3D"font-family:arial;font-size:16px;">
<div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, sa=
ns-serif;font-size:13px;color:#26282a;">
=20
<div class=3D"quoted-text-header">
On Tuesday, January 20, 2026 at 04:16:51 PM EST, Chu=
ck Gee via Fot <fot@autox.team.net> wrote:
</div>
</div><div style=3D"font-family:'Helvetica Neue', Helvetica,=
Arial, sans-serif;font-size:13px;color:#26282a;border-left: 1px solid #ccc;=
padding-left: 8px;margin: 0px 0px 0px 8px" class=3D"inline_reply_quote_conta=
iner">
<div><br></div><div><br></div>
<div><div dir=3D"ltr">Hello all,<br></div><div dir=3D"ltr"><=
br></div><div dir=3D"ltr">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 s=
ystem. This tank feeds the top of the radiator but doesn=E2=80=99t rea=
lly circulate during operation. I=E2=80=99ve been thinking of plumbing=
the feed off of the back of the head into the top of the tank so that it ci=
rculates. <br></div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Normal=
ly this rear head feed is plumbed to the back of the water pump. In an=
exercise of overthinking, I=E2=80=99m not sure if there will be sufficient c=
irculation since the tank is plumbed to the radiator. Does it matter?&=
nbsp; What is the collective wisdom?<br></div><div dir=3D"ltr"><br></div><di=
v dir=3D"ltr">Here are some pictures to help illustrate.<br></div><div dir=3D=
"ltr"><br></div><div dir=3D"ltr">Thanks,<br></div><div dir=3D"ltr"><br></div=
><div dir=3D"ltr">Chuck<br></div><div dir=3D"ltr"><br></div><br>____________=
___________________________________<br><a ymailto=3D"mailto:fot@autox.team.n=
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</div>
</div></div><span>_______________________________________________</s=
pan><br><span>fot@autox.team.net</span><br><span></span><br><span>http://www=
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