440 Engine tuning suggestions

Thank you to everyone foe the suggestions.

@Bewy my bad, yes the manifold is a single plane. Thank you for linking the articles and high lighting the text for me to read. Any idea which magazine that one was from?

@RustyRatRod

Thank you, i will try that.

@crackedback

Thank you, i will try that.

does anyone have suggestions on a spark plug that they have used and like for something like this?