Re: How much overbore?

Posted by Randy Berger On 2010/12/14 22:21:00

They may have changed the cores between 55 and 56 so you may not be able to bore out a 352 to a 374. I would think it was common practice to change the cores because the walls should be a certain thickness. AND you could have a core shift when pouring. The exterior blocks are the same, but that doesn't mean the internals are the same.
A competent machine shop would blueprint the block first and then they would know for sure. In the Feb 57 issue of HOTROD there was a Stude Golden Hawk that was bored out to 374, but it was also stroked, given a dual-4 intake and a magneto ignition. It was turning over 140mph at Bonneville with a bad magneto ignition. The car was from Texas, but I don't know what happened to it.