[Fot] Collective wisdom

[Joe Boruch]

 I do not have a header tank, so I cannot help you with plumbing of that.  I welded a fill port to the top of my thermostat housing (see attached pic).  It is the highest point on my cooling system.  I also have a 4AN line from the heater hose port and the back of the head running up to the tsat by-pass port on the tstat housing.  The fitting for the 4AN line is restricted down to 1/8 inch.  This is to allow for venting and a small amount of circulation from the back of the head.  JoeB


    On Tuesday, January 20, 2026 at 04:35:01 PM EST, Chuck Gee via Fot <fot at autox.team.net> wrote:  
 
 Hello all,

In an effort to constantly improve the car, I’ve 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’t really circulate during operation.  I’ve been thinking of plumbing the feed off of the back of the head into the top of the tank so that it circulates.  

Normally this rear head feed is plumbed to the back of the water pump.  In an exercise of overthinking, I’m not sure if there will be sufficient 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


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