Hi Jason and members, great to see the site is still so popular and so many great cars around. Could you help me with a problem? Does anyone know the size of the bolt needed to thread into the crankshaft to install the harmonic balancer? This is for a '63 with the 390 ci. The manual says use a bolt from a '62 but no size specified. I know I will need an installer tool, just need to get one with the right adapter. Assuming I can get the balancer off to start with of course which is causing some problems at the moment. Any help appreciated. Many thanks, Rich
Per shop manual and as you noted you need to use the 59 to 62 front harmonic balancer bolt and washer to install the 63 & 64 harmonic balancers.
The bolt size is 9/16" - 18 and usually about 1 5/8" long...with a very thick large washer. You need the puller tool to get it off but just the large thick bolt and washer to put it back on. This bolt size is usually not one stocked in your typical hardware store but I have a stock of new yellow zink plated Grade-8 9/16" - 18 steel bolts that I sell for $5. If interested shoot me an email to email@example.com