Best 350 OEM Block

[carl hinkson]

Originally Posted by MAURICE BLENDHEIM

Carl… We've found the "386" and "388" blocks to be good also. They are usually Early 1968-69 castings, prior to the "010". The early 1969-70 "010" are very solid also, and in most cases have a "K12" behind the passenger cylinder head at rear of block. Always consider core shift that is noticeable at cam tunnel, try and find a block that has the cam tunnel bored centred with the thrust flange. Good Luck…MB.

I should also add if you can find an 010/020 with 2482 on the center caps, Don't go by core shift as a sonic test is the only real way to tell if you have proper cylinder wall thickness.

I have about 40 blocks that show no core shift but have failed a sonic test and have seen many blocks that show a ton of core shift but the cylinders were fine. Most blocks I have failed is because of one thin cylinder.