How many miles of city driving to break in, before freeway miles
I built a nice Vortec headed roller 350 with the GM Hot Cam. I've been driving around town to break it in with an occasional blast of acceleration. I have a really long freeway commute of about 100 miles and I'd like to start driving this project car with my new engine to keep from racking up miles on my daily driver and killing its value. But I didn't want to jump on the freeway and have it drone on at the same rpm for hours until it had been well broken in at various rpms.
So how many miles do you think it needs around town before seeing several weeks of freeway boredom?