Cool...pick their brain on 409's...see if there was a different method ...all the examples I've seen are like the above...keep the Vette guys by your place and entertain them.
....BTW very cool pic of the broaching machine on that link...thats a 90 degree deck angle so I am really curious about the 74 degree now unlees that thing was adjustable which I doubt.
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Don't mess with old farts - age and treachery will always overcome youth and skill! Bullshit and brilliance only come with age and experience.