Reply To: What’s this hole for? – 1965 40 HP Jounson

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October 27, 2025 at 10:42 pm #301003
David Stanton
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    Saltymotor wrote:

    That’s the air intake for the hot air choke.

    That makes sense! I’ve seen that done on a lot of 1960s cars with automatic chokes that have a tube running in and out of the exhaust manifold.
    Thanks! I have some 1960-1963 40s, and those have a different automatic choke that I believe used hot water. I just did some online searching and found that hot exhaust method of heating the air to the automatic choke bimetal was introduced on these 40s in 1964.
    Dave