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Darrell:
Did you ever find out any more info on the 550's? I'm interested in that I have a matched set of P/N #1849 which I believe are 550's. I really haven't looked hard but the 3 Holley books I have do not reference the 1849s. They are not center-squirters and from what I can tell (and this is visual reference only) they are identical to 1850s, just with a smaller base bore.
Thanks!
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Jimbo
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