[Greg Reimer 7376]

The 512 block was a service replacement block.Some had date codes as late as 69 or70. Some,I've been told were large journal,so be careful there. We've used them in our 327 stockers, and they do show up from time to time,so they aren't that rare if your search is diligent enough.The oil filter area is machined for a screw on filter(68 on), and some of the features on the block resemble early large journal 350 blocks. Chevrolet used to offer three stages of replacement engine- a fitted block,which came with the block,main bearings,pistons,pins,and rings with cam bearings already installed. A partial engine was a short block,sometimes with a camshaft and timing gears and cover installed,and a complete engine came with the short block,oil pump,pan,heads,valve train and covers installed.It's possible that 512 blocks came in all three configurations. The 512 is a good part if you can find it,other than the small journal crank diameter, there is probably not much advantage to scouring the earth to find one. A large journal 327 can use the stronger 350 rod forgings and 350 010/020 blocks are still much more common.The 010/020 block in my Chevelle originally started life in my 71 El Camino that I had years ago.