[jeff germano]

I just put in a 79 350. it has just been rebuilt. what is the best way to break it in. I have been just driving it easy and not taking it over 2500 rpm's. I know i should go easy till 500 miles but is there anyhting else?

[BOBCRMAN@aol.com]

the proper way to break in a new engine is to fire it take it to 2500 rpm and hold it there for 15-20 minutes, this is to break in the cam, then drive it as you would normally but vary speeds often, for the first 500 miles. you will find that with the correct cyl wall finish and modern rings that the motor will be sealed up by the time you get it out of the garage

[Weimer]

The only thing that I have ever done to break in an engine is the 2500rpm/20min. thing for the cam.
After the 20 mins. are up, shut it down, change the oil and drive as normal.
If something is going to break...it'll do in the first 20 mins.
How often do you see racing teams 'break in' an engine at the track.
I could be wrong on this though...but it has worked for me in the past,why change now.
Later,
WEIMER

[Brendan]

Well Jeff,the (at least) 20 minute cam break in is a must (although a half hour to 40 min is much safer).Depending on wether or not the engine was bored and has perfectly cylindrical cylinders or not do you extend the break in.If bored and your bearing clearances are .002 to .0027 break in the cam and drive as usual just watch your oil pressure real close for the first bit and be reasonable with your revs.Were your rods resised?New cam brgs?New rod bolts?Too many variables bud. Just respect her till she feels right.You'll know.

[jeff germano]

Thanks alot guys. I am wondering. i ran my motor for 15 at 17 hundrreds rpm is that good enough.