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<DIV>There are water crossover passages at the front and rear of many small
block Ford factory intakes. There are generally two coolant connection points on
the front passage. One is for the coolant temperature sender. The other feeds
through the heater circuit. Assuming the day is hot and the heater
wouldn't be activated there is no circulation of coolant to the heater. So there
is no difference between the hose hooked properly with the heater valve closed,
or it being blocked off. IF (a big if) one was willing to turn on the
heater on a hot day there is the OPTION of getting additional cooling through
the heater. But it is just that, an unpleasant option. I’m assuming your
manifold does not lack a rear crossover. Some manifold designs eliminate the
rear crossover passage. Here is one of the debates on the issue. I’m sure you
can find more. <A
title=http://mmb.maverick.to/threads/rear-intake-flow-topic-from-franks-build-thread.79331/
style='href: "http://mmb.maverick.to/threads/rear-intake-flow-topic-from-franks-build-thread.79331/"'>http://mmb.maverick.to/threads/rear-intake-flow-topic-from-franks-build-thread.79331/</A>
There is a possibility that someone added fittings at the rear of an aftermarket
(non-rear crossover) manifold and a bridging hose is not present on
yours???</DIV>
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<DIV
style='FONT-SIZE: small; TEXT-DECORATION: none; FONT-FAMILY: "Calibri"; FONT-WEIGHT: normal; COLOR: #000000; FONT-STYLE: normal; DISPLAY: inline'><B>From:</B>
<A title=CoolVT@aol.com href="mailto:CoolVT@aol.com">CoolVT@aol.com</A> </DIV>
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<DIV><B>Sent:</B> Wednesday, March 01, 2017 12:32 PM</DIV>
<DIV><B>To:</B> <A title=atwittsend@verizon.net
href="mailto:atwittsend@verizon.net">atwittsend@verizon.net</A> </DIV>
<DIV><B>Subject:</B> Re: [Tigers] Intake coolant</DIV></DIV></DIV>
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<DIV>I do indeed have an "air gap" on the Tiger. I was asking the question
because of another SBF vehicle that I recently purchased in Florida.
The coolant hose going into the manifold has been cut and plugged. My
local guy said it was necessary for cooling. I'm betting the underhood
temps of cars down here can get to 250 degrees so maybe it would help in
cooling for a southern vehicle.</DIV>
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<DIV><FONT lang=0 size=3 face=Arial ptsize="12" family="SANSSERIF">Mark L
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<DIV>In a message dated 3/1/2017 12:05:39 P.M. Eastern Standard Time,
atwittsend@verizon.net writes:</DIV>
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<DIV>Yes, in day to day driving the heated intake manifold helps to keep
fuel droplets in a vapor state. Obviously in colder weather this is even
more practical. This can both increase mileage and improve
emissions. However, it would seem to not help keep the intake
cooler (as in the mentioned south) unless the ambient outside air
temperature was over 180+ degrees! Some engines simply use the intake
manifold as a “crossover” passage between the cylinder heads for coolant
flow to balance the heat in the engine. A lot of engines also run
exhaust gases under the center of the intake (under the carburetor) for
the same purpose. These are basic statements about a engines in general
regarding a heated intake manifold and not the small block Ford in
particular.</DIV>
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<DIV> Your intake manifold is likely an “air gap” style.
While a heated intake is practical for reasons stated above..., it is
not the best design for outright performance. A cooler intake condenses
the air and puts more of it into the engine, thus increasing
performance. The air gap design isolates the intake runners from any
coolant, exhaust cross over gasses and even the heat from oil under the
intake manifold in most “V” style engines. If you are noticing no
difference be thankful. You have likely gained some performance
advantage without suffering the corresponding problems that can
potential arise.</DIV>
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<DIV style="font-color: black"><B>From:</B> <A
title=mailto:tigers@autox.team.net>CoolVT--- via Tigers</A> </DIV>
<DIV><B>Sent:</B> Wednesday, March 01, 2017 6:33 AM</DIV>
<DIV><B>To:</B> <A
title=mailto:tigers@autox.team.net>tigers@autox.team.net</A> </DIV>
<DIV><B>Subject:</B> [Tigers] Intake coolant</DIV></DIV></DIV>
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<DIV>Coolant is run through the stock intake. What is the purpose
of the coolant running through? Thought I had heard that it was to
help warm the intake in cooler weather. Down south I am
hearing it's to help cool the intake. So, what is the exact
purpose? I have an aftermarket intake on the Tiger with no
coolant passages and don't see any difference.</DIV>
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<DIV><FONT lang=0 size=3 face=Arial ptsize="12"
family="SANSSERIF">Mark
L</FONT></DIV></DIV></TD></TR></TBODY></TABLE></DIV></DIV></DIV></FONT></BLOCKQUOTE></DIV></FONT></DIV></DIV></TD></TR></TBODY></TABLE></DIV></DIV></DIV></DIV></BODY></HTML>