Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - 1968 gto 400 build questions
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Old 02-25-2013, 05:41 AM
454C10 454C10 is offline
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I would leave the stock 400 alone and get another engine to modify. Look for a 455.

Take your time and build it up right, then drop it in over a long weekend.

Check the pontiac performance sites to get more specific advice.
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