MTFCA Forum

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!

Open your wallet for a new Prus head.

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.