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New cam break in

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Paxx, Feb 16, 2004.

  1. Paxx

    Paxx 1/2 ton status

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    What do you do to break in a new cam? I heard that you get up to 3000rpm and leave it there for 15min. Is this correct?

    thnx
    ~Max
     
  2. 88Silverado

    88Silverado 1/2 ton status

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    I assume its a flat tap hydro cam. Start it and immeadiately set the timing, then take it to 2000-2500 rpm and hold it there for 15 minutes. At a steady-state 2000 rpm, the valvetrain places the least possible load on the cam to lifter interface.
     
  3. k20

    k20 3/4 ton status

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    i have heard 2000 for 20 mins, but anyway....Once that is done you need to change the oil to get assembly lube and bits of metal out of the system. Also the engine usually gets pretty hot during cam break in. Have heard of peoples headers glowing red. I got to skip all that w/ a roller cam, this gives you a good idea.
     
  4. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    Like everyone said...i don't have a tach yet and when I put my new motor in I just revved it up to where it sounded to be around 2,000RPM's and left it there for about 15 mins.
     
  5. BigRed89

    BigRed89 1/2 ton status

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    If you have access to a large fan, it's a good idea to set that up in front of your vehicle to help get some cool air through the radiator and engine bay. Also, follow along with what the others have said. Good luck!
     
  6. 85scottsdale

    85scottsdale 1/2 ton status

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    The way we did my friends 350 when we installed that XE262 cam we did it via comps instructions which said to vary the rpm between 2000 and 2500 or so. We used the idle speed adjustment to hold it there and used a water hose spraying the radiator to keep it cool. They said to do this for about 30 mins.
     
  7. 99firehawk

    99firehawk 1/2 ton status

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    I do mine at 2000 for 10 2500 for 20 electric fans usually keep it cool, if not a box fan works great.
     

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