Classic Engine Tech 1967 - 1981 Engine Related

Break in question...

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Old Nov 25, 2008 | 10:40 PM
  #1  
81z28phil's Avatar
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Break in question...

New motor, So eh whats the proper way to break it in?
Old Mar 1, 2009 | 08:28 AM
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doc221978's Avatar
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Street or race engine?

For the street I keep it between 1,500-200 rpm's for about 15 minutes then drive it light for around 2-3,000 miles.

Depending on the type of race engine..... drag has no break-in, and endurance engines I run it at 3,000 rpm's for 30 minutes.

You can get 20 different answers from 20 different people though.
Old Mar 2, 2009 | 10:28 AM
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Z28SORR's Avatar
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From: Friendswood, TX, USA
Well, there didn't used to be 20 different answers. Initial break-in on a "classic" engine is for the flat tappit cam. After coating the cam lobes and lifters with assembly lube, start and run the engine for at least 20 min. at ~ 2000rpm. After that, final tuning is done and then you can drive it. Used to be that 500m., at varing rpm, was concidered enough for proper ring set-in. This should be done with "high zinc dino" oil, like racing oil or bike oil. Nothing wrong with longer break-in times, but I have never seen any Data that indicates it is necessary. After that change the oil and filter, with your choice.
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