Low vs. High Head

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Petrah Phyre
Posts: 165
Joined: Wed Mar 17, 2021 9:57 pm
First Name: Sean
Last Name: Pownall
* REQUIRED* Type and Year of Model Ts owned: 1926 Speedster
Location: Custer, SD
Board Member Since: 2021

Low vs. High Head

Post by Petrah Phyre » Fri Feb 06, 2026 6:36 pm

My '26 speedster came with a low head. I have a high head in my stash. It looks like the high head has larger water jackets (better cooling?). What would your suggestions be on which would be best and why?

Thanks!


speedytinc
Posts: 5199
Joined: Fri Feb 12, 2021 12:24 pm
First Name: john
Last Name: karvaly
* REQUIRED* Type and Year of Model Ts owned: 14/15 wide track roadster. 23 touring, 27 roadster pickup, 20ish rajo touring
Location: orange, ca
Board Member Since: 2020

Re: Low vs. High Head

Post by speedytinc » Fri Feb 06, 2026 6:53 pm

Open your wallet for a new Prus head.


Jerry VanOoteghem
Posts: 4417
Joined: Sun Jan 06, 2019 4:06 pm
First Name: Jerry
Last Name: Van
Location: S.E. Michigan

Re: Low vs. High Head

Post by Jerry VanOoteghem » Fri Feb 06, 2026 7:18 pm

Petrah Phyre wrote:
Fri Feb 06, 2026 6:36 pm
My '26 speedster came with a low head. I have a high head in my stash. It looks like the high head has larger water jackets (better cooling?). What would your suggestions be on which would be best and why?

Thanks!
To answer your question, it kind of depends on what radiator you're using. The low head water outlet lines up well with a brass radiator and high head lines up better with a later, high radiator, (all assuming you're also using the correct water outlet for each). Since you have a speedster, any combination could be possible. I would tend to use the head that fits up well with whatever radiator you have.

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