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Old 01-11-2020, 07:39 PM   #4
Hal Beatty
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Join Date: Jul 2012
Location: Bellingham, WA
Posts: 113
Default Re: Rebuilt motor start up

New cam and lifters? If so, you'll need to run it at 2,000-2,500 rpm for 20 minutes to break them in... even though flatheads don't run the valve spring pressures that overheads do I'd want to do a good break-in on these parts.
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