Quote:
Originally Posted by Flying Undertaker
...Big Blocks were usually stamped either 40170 or 40731, Small Blocks had the metal tag with the stamped number. Small Blocks had the cast aluminum bottom cover as shown, Big Blocks had either the cast cover but more often had the stamped steel gold iridite cover. Don.
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Hmm, my big block pump is a 40170 with a stamped metal tag, cast cover, nothing stamped on the body. Just "Made in the USA" cast into the underside of the body flange.