If you have a roller cam I believe it's not nearly as important to keep the
engine running for the 20 minutes. It is important, however to NOT use a
synthetic oil (like Mobil 1) for break-in ESPECIALLY if you have a
conventional (non-roller) camshaft.
----- Original Message -----
From: Curtis Fisher <Curtis.Fisher@trw.com>
Sent: Saturday, March 18, 2000 9:29 PM
Subject: engine start-up advice
> Newsgroup, I am about to start my Ford crate motor for the first time. It
> is a production motor that came down the same assembly line as 5.0 motors.
> I bought it as a long block and added induction, exhaust, ignition and
> accessories. When you first start a new motor, what is the recommended
> procedure? (not driving, just in the car) I've read Haynes, Chiltons and
> heard other advices. Should I run it 20 minutes on the first start to
> properly 'condition' parts like the cam and other? Folks at the Mustang
> Ranch tell me 15-20 minutes at 1,500-2,000 is the minimum or I'll
> improperly break in the cam, Speed Merchant said 20-30 minutes (at 2000).
> Haynes does not have any precautions other than monitoring for noises. Can
> you advise me and others about the correct method and rationale? Looking
> forward to your advice.
> Curtis in Santa Clara