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New engine break-in

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09-04-2009, 05:01 PM	#1
6TNiner Registered User Join Date: Sep 2008 Location: Seattle, WA Posts: 24	New engine break-in What is the proper way to break-in new engine? I've got a new GM Performance 350 crate dropped in on my 69. Mechanic said to run it hard? Any suggestions. Have under 20miles on run gently. thanks all.

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