Re: The Duchess Project: 1940 Super 8 Convertible Sedan

Posted by HH56 On 2018/1/15 16:44:56

G606xxx appears to be a fairly early engine in 48 production so there is a chance it could have cut threads in the block. I am sure the rolled thread studs will not thread into the cut thread blocks easily because of the larger diameter and different shape and believe that is what Packard is saying in the article. I do not know how the cut thread studs go into rolled thread blocks but with the cut thread studs having smaller diameter threads as mentioned in the article that could be why there is an issue. Here is the bulletin explaining the studs.

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