1965 Cadillac 365 Rebuild

[flahivek]

Looking for help finding a new harmonic balancer bolt and a new head bolt (4.385") for my 365 engine I'm rebuilding. I've had no luck finding these online.

[fishnjim]

Could it be because it's a '65 429 and you're looking for 365?   Or was a 365 transplanted?   
I know the '58 365 HB has to be rebuilt, no parts.   
The bolts should be available, but will have to measure it and type it to find.   They didn't change all that much so another year will probably fit.

[35-709]

Assuming this is a 429 (which it would be in 1965) and not a 365 --- if you are looking for the center bolt, there is none.  That threaded hole is there to use a factory type puller to remove the balancer, and then to reinstall the balancer with a fine thread bolt you can get at any decent hardware store.  Don't remember the length, diameter, and thread pitch off hand, but Bruce Reynolds will if he sees this post.  That hole was plugged from the factory with a large cork to protect the threads.  IF this is the bolt you are talking about, once the balancer is reinstalled you can leave the bolt in place there, or remove it and find a large cork (believe I found one at an arts and crafts store) to put in the hole as the factory did.
I may have a used 429 head bolt if you are interested. 

[Big Fins]

The center bolt is a 9/16"-18. It is used to draw the balancer and pulley onto the crank. Then you remove it and place the cork plug in there. I need to get a picture to show you so you know what we mean.

[Jeffrey Burland]

It could be he mistyped 1956. Then it all makes sense....

[35-709]

   Indeed!

[Lexi]

Must be a typo. If not and is a transplanted 365, I may have a spare one here somewhere. Clay/Lexi

[35-709]

From this thread it apparently is a typo ---
https://forums.cadillaclasalleclub.org/index.php?topic=167967.msg516465#new

[Jeffrey Burland]

Those 65 crank bolts are 9/16" fine thread. Just a cork in the hole to keep it clean and NOT have guys try and crank the engine over with it in order to not damage it. Make sure you use a 4 bolt puller like the Kent Moore type in the shop manual or you'll run into all sorts of issues.

[flahivek]

My apologies, Yes it is a 1956!!! not 65.