Building a Small Block Chevy: 1985, 305
Page 14 of 82

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After insuring the crank rotates freely, remove the last main cap. Using
a small punch push the rear main seal down into the block about 3/8 of
an inch, it will stick out the same amount on the other side. Now apply a
small amount of silicone along the edge where the cap meets the block
about a half inch long.