Re: Replace head studs with bolts?
Posted by HH56 On 2019/4/15 10:49:26
I will let others suggest the best repair method for the stripped hole but you can get the missing studs from Kanterhttps://www.kanter.com/packard/ or probably Max Merritthttp://www.maxmerrittauto.com Some of the various stud lengths needed on some engines are still NOS and others have been done in repro.
I would be concerned about using bolts for two reasons. First is thread length and whether the bolt would bottom before the head had the proper torque. There would be no way of knowing if the final torque reading you are looking for was due to the thread bottoming or was in fact correct. Improper torque on the heads is the primary reason for blown head gaskets.
The second reason is that by the time your 25th series 52 car was produced all the blocks had rolled threads. Modern bolts could well have threads more resembling the cut type and may have issues either with sealing against the water leaks Packard was trying to control or threading in properly. Whatever method you use to repair the hole will determine what type thread is needed there but it would probably be the standard or cut type.
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I would be concerned about using bolts for two reasons. First is thread length and whether the bolt would bottom before the head had the proper torque. There would be no way of knowing if the final torque reading you are looking for was due to the thread bottoming or was in fact correct. Improper torque on the heads is the primary reason for blown head gaskets.
The second reason is that by the time your 25th series 52 car was produced all the blocks had rolled threads. Modern bolts could well have threads more resembling the cut type and may have issues either with sealing against the water leaks Packard was trying to control or threading in properly. Whatever method you use to repair the hole will determine what type thread is needed there but it would probably be the standard or cut type.
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