66 Engine casting ID
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Re: 66 Engine casting ID
That's interesting. I wonder why the change? As far as I know, all Mark I big blocks were machined and assembled at Tonawanda. Also, the Tonawanda foundry did not shut down until 1984. So, I wonder why they transferred casting of the Mark I from Tonawanda to Saginaw?In Appreciation of John Hinckley- Top
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Re: 66 Engine casting ID
Cecil------
That's interesting. I wonder why the change? As far as I know, all Mark I big blocks were machined and assembled at Tonawanda. Also, the Tonawanda foundry did not shut down until 1984. So, I wonder why they transferred casting of the Mark I from Tonawanda to Saginaw?
I've never been able to find out exactly why, but all W blocks from late 62 on have CFD and Julian dates instead of casting dates. One of my other hobbies is researching the W engines and I find them challenging and just as interesting as Corvette history with less documentation available.
One example that many aren't aware of is broach marks. Everybody is looking for the standard longitudinal lines on the stamp pad, but W blocks never had them. A virgin W block has the typical swirl marks from a rotary cutter or stone. Can't prove anything but my guess is because of the 74 degree angle on the deck not being compatible with the broaching machine.
Sorry, didn't mean to hijack the thread.- Top
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Re: 66 Engine casting ID
A friend of mine also follows the "W" blocks, and said the same thing; the oddball-angle "W"-block decks were machined with rotary cutters, not broached.- Top
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