Quote:
Originally Posted by tim ayers
the pencil test is "general" way to tell the age of the block. Like many things ford, it's not a steadfast rule. The 59l block i used for my motor passes the pencil test when, by all accounts, it shouldn't.
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there are some early 59 blocks that also have the so called ledge and pass the pencil test. They have the big 59 on bellhousing and i believe they were identified as 41a cast during the 1944 1945 era. I have one here.