Board index Flathead Power-Technical Questions, Answers, and Suggestions Knuckles 39 small port heads on a later 74

39 small port heads on a later 74

Moderators: Curt!, Pa

Post Wed Sep 24, 2008 2:45 pm
Want to try my original 39 (small port) EL heads on my later 74. Any issues to be concerned with? I wonder how the intake manifold will line up but any tips would be greatly appreciated.

Post Wed Sep 24, 2008 3:31 pm

Posts: 2685
Location: Los Angeles, CA
BrentCross@Bronko's wrote:
Want to try my original 39 (small port) EL heads on my later 74. Any issues to be concerned with? I wonder how the intake manifold will line up but any tips would be greatly appreciated.


Being as the size of the intake nipples are different on the 1936-'39 heads VS the 1940-'47 heads you will have to use a '36-'39 intake. Your 74 jugs don't have a fire ring on them so there should be no problem there.


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