Thread: 403 Olds engine
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Old August 10th, 2008, 11:52 AM   #11 (permalink)
joe_padavano
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To clarify the info above, the discussion about manifolds was concerned with automotive manifolds. Most marine manifolds I've seen for an Olds will fit both big and small blocks the same. Depending on which ones you have, they should fit both a 403 and 455 just fine.
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