In some years they changed the letters. (SD 455 is one I believe)
I have a Craftsman Service News on one of the changes. It also showed the specs for each letter.
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John Wallace - johnta1
Pontiac Power RULES !!!
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Winner of Top Class at Pontiac Nationals, 2004 Cordova
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KRE's MR-1 - 1st 5 second Pontiac block ever!
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