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#11
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Obviously someone scraped and damaged the pad. I believe the 409 did not have the traditional small/ big blocks, fore-aft broach marks, although there were circular machine markings. Hopefully a 409 guru can shed some light...
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Steve Shauger The Supercar Registry www.yenko.net Vintage Certification™ , Providing Recognition to Unrestored Muscle Cars. Website: www.vintagecertification.com |
#12
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That is pretty sad, scratching lines with an awl or something. I went through this with Verne a couple years ago. Apparently the relatively small volumes of 348/409 engines didn't justify the expense of the big planing machine that did that operation for the small blocks (and later big blocks). Thus production used a rotary machining operation for preparing the 74 degree deck surface of the W motors.
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#13
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Looks like that would be easy to copy.
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Freddie 1969 Camaro RS/SS396 (427) 4 speed |
#14
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I’m not sure-they look kinda like regular broach marks where none of the lines intersect. You’d have to use a very large diameter, uniform grinding surface that came down on the surface flat and didn’t move laterally.
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#15
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A friend of mine has a machine that is used for resurfacing heads and blocks that makes the same pattern when it cuts. It has a large wheel with carbide inserts. It made that same pattern on my heads when we cut them.
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Freddie 1969 Camaro RS/SS396 (427) 4 speed |
#16
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#17
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West Chester. My Alma Mater and still only 25 mins away
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