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#1
10-20-2005, 05:21 AM
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Broaching
Here is a 63 409 engine...untouched...seems they didn't machine or broach them early on like they did later///anyone know when they changed machining ??...this shows it better
__________________
 <span style="font-weight: bold"> (__{B}_____]]]]~~~~</span>Don't mess with old farts - age and treachery will always overcome youth and skill! Bullshit and brilliance only come with age and experience. 
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#2
10-20-2005, 06:20 AM
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Re: Broaching
So now im really mixed up.
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1967 Nova SS L30 1967 Chevelle L79 1969 RS Z/28 Red 1969 RS Z/28 Lemans Blue 1970 Z/28 Blue 1967 RS Convertible 1968 Camaro SS 1992 GMC Yukon 30166 miles
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#4
10-20-2005, 06:37 AM
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Re: Broaching
I know that all Corvette blocks have broach marks even back in the '50's...I'd say that block has been machined at some point.
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Mark
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#5
10-20-2005, 06:50 AM
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Re: Broaching
Yes Sam and it hasn't ever been machined.
__________________
<span style="font-weight: bold"> (__{B}_____]]]]~~~~</span>Don't mess with old farts - age and treachery will always overcome youth and skill! Bullshit and brilliance only come with age and experience.
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#6
10-20-2005, 06:55 AM
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Re: Broaching
Looks to me like it has been machined.
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......
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#7
10-20-2005, 06:25 PM
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Re: Broaching
Bob:
I've seen untouched blocks with no apparent machine marks like yours. I've never liked the term "broach" as I don't think it applies to a one dimensional removal of material - keyways or holes are broached. My educated guess is that the "broach" marks everyone talks about are actually the machine marks left by a planer. Unlike a rotary milling cutter (which were certainly in use prior to the 70's), a planer has a moveable bed which can be quite large (10'x 50' or more) so that a large number of blocks can be planed at once. The cutting tool(s) is fixed and the work piece (block) moves in relation to it. The tool "shaves" the iron in a straight line parallel to the crank. This method was apparently more economical for large production runs than milling using a rotary cutter in years past. Planers were widely used from the 1800's through WWII and are almost non-existant in production in any industry today. I believe the planer (broach) marks could and did vary considerably depending upon the cut, tool profile, etc. Dave
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#8
10-20-2005, 06:52 PM
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Re: Broaching
Planing marks are what we all are used to...these are circular patter it seems but hairline...I know it was not restamped or monkeyed with so the only thing I can figure is a light cleanup with something circular...guess it doesn't matter anyway.
__________________
<span style="font-weight: bold"> (__{B}_____]]]]~~~~</span>Don't mess with old farts - age and treachery will always overcome youth and skill! Bullshit and brilliance only come with age and experience.
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#9
10-20-2005, 07:05 PM
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Re: Broaching
Bob,
I'm very certain those machining marks are original, and so are the stampings. I'll email you another photo of an original you can post for comparison. (what's the Julian date on the back of that 814 block?) Verne
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#10
10-20-2005, 07:10 PM
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Re: Broaching
320 Verne....thanks for the help with the 64 too..together we are going to figure this weird old car out !!!
__________________
<span style="font-weight: bold"> (__{B}_____]]]]~~~~</span>Don't mess with old farts - age and treachery will always overcome youth and skill! Bullshit and brilliance only come with age and experience.
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