Quote:
Originally Posted by Chris Haynes
What is different about a Late B Block?
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The early B engines didn't have a counter balanced crank shaft. Later, they did and when an early one came in for rebuild, weights were added. Later again, B engines were used in agricultural equipment and all sort of machinery, even after production for cars stopped. Those engines can be readily identified by a small diamond cast on the side of the block just under the water pump (in front of the side cover) on the RHS. They are referred to as a "Diamond B" engine. As to just the block itself, I am not aware of there being any difference - it was the internals that were different. Others might confirm or correct that.