It does beg the question, if they were going to distinguish 4-bolt blocks for cast pistons by adding the "A", why not just stamp it as 9799914 which was the Ram Air III casting number?
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Hoping to finish a project while I'm still able to push the clutch in.... 
1963 Tempest Convertible (Ram Air IV w/4” stroke), TKX, 9-inch w/3.70 gears and triangulated 4-link) Pictures
Last edited by tekuhn; 10-19-2021 at 06:11 PM.
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