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Have my 356, 9 main bearing 1947 engine taken out of the 2126, torn down, steamed and ready to start the rebuild. The shop is a well equipped machine shop that rebuilds approximately 200 engines per year. That said, they work primarily on small and big block v-8's and the occasional 6 cylinder and diesel blocks. The question we all have is, 'how do the counterweights on the crank come apart and more importantly, go back together. Seems there must be a shop that does this work regularly and most of the mystery has been figured out. Obviously there are three fastenings with steel plug covers holding the counterweights in place. The plugs appear to be secured with either tack welds, rivets or brads. Would be happy enough to send the crank out to get turned and put back together ready for the oversize bearings to be installed. Apparently there is a .003 discrepancy in the journals with the shape being a bit egged or oval from top to bottom. Any suggestions would be appreciated
Car has been in the family since 1956 and has about 107K miles on engine.

Here is a thread with one answer to the question. The particular engine is not the 356 but method is similar if not the same. The fourth post has links to some more threads with additional detail on various engines.https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=152467#forumpost152467

Thanks for the quick response. I did check out the thread and does seem to make sense. The 356 does have 8 of the counterweights so not sure how much additional $$ that will add to the job. Also, have sourced the bolts to replace which weren't too expensive. Still a bit daunting of a task but unfortunately necessary. question remains....what are the "keepers" for the bolts that are shown as pairs for each of the three fastenings as in picture below. There will be 48 of them to remove/drill/grind out

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The removable counter weights need to have the plug and the heads milled (drilled) out. Remove the counter weight, and then the remaining stud.

To assemble after grinding, normally counter sink to accept a standard allen bolt. This will make tear down a snap for the next guy.

Shop rate if we remove bolts for customers is $350.