300 break in process
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Cargo Master
Joined: Mar 2008
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From: Goliad, Texas
300 break in process
we just got done with a rebuild on the 300 in our 79 F100. I bought the royal purple break in oil from o'reilly. I put it in and the truck starts and runs good, but I would like to know the break in process to do it correctly. the only bad thing is I don't have a tachometer on this truck. would there be any other way to do this?
Senior User
Joined: Apr 2014
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Ive had 2 of the sunpro 3 tachs and ive had issues with both on different trucks. They seemed to only work when they wanted to and at times read 0 rpm on a 95 as well as a 78 pickup. My friend had one in his pulling truck and same issue. Not sure if a bad batch or not. We got them at the local autozone.
Postmaster
Joined: Nov 2011
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Last break-in I did was "tachless". You want 2000+ RPM for 20+ minutes for the cam/lifters. 2000 RPM is more than a fast idle but not revved crazy high. I judged by ear and varied a bit. It worked. Getting the timing and mixture in the ball park along with a good fan in front of the radiator helps a lot in avoiding overheating. After the cam break-in, it needs some load to seat the rings. Adjust timing and mixture as needed then drive it, step on it but not continuously for a while and enjoy it.
A "known good" carb on break-in helps a lot in getting the mixture close.
A "known good" carb on break-in helps a lot in getting the mixture close.
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Cargo Master
Joined: Mar 2008
Posts: 2,409
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From: Goliad, Texas
true story. I guess it's time to invest in a tach.
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Cargo Master
Joined: Oct 2010
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As stated above get a tach. Break in that cam at 1500 to 2000 rpm for 15 to 20 min. After she cools down change the oil. Make sure you add some zddp as well.
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Cargo Master
Joined: Oct 2010
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As long as it brings the zddp to an acceptable ppm you should be good. From what I understand including your base oil, 2000 parts per million is a good number to be at.
Lead Driver
Joined: Mar 2008
Posts: 7,193
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From: Near Los Angeles
You should be fine. Some cam mfg's like you to use an oil additive for normal use. Check with them and see if you should use one. Good luck. BTW, there is an inline forum here.
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Cargo Master
Joined: Mar 2008
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From: Goliad, Texas
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TallPaul
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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Apr 25, 2000 05:17 AM