Quote:
Originally Posted by Tim Ayers
I need to ask, what is the pencil test?
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Early blocks had a "shelf" cast into the block just above the timing cover. Later blocks do not. The pencil test refers to being able to lay a pencil on this shelf.
"All pre WW2 flathead engines, including the 21 stud, will pass the so called "Pencil Test". This pre war blocks have a tiny shelf above the timing cover. The shelf is deep enough to horizontal lay a pencil on it. All post war blocks will fail the pencil test."
Picture from 38 coupes post (the one often referenced for block ID). The test is not about the timing cover holding up the pencil, but the shelf cast into the block.