Don't break it.
Are you seriously saying the shop that did the work for you or supplied the engine didn't give you break-in instructions?
Don't hop on it. Don't beat it to shreds. Drive carefully. Check the engine exterior and the oil level and condition every couple of days. Watch for leaks and the level going down. The exact length of the break-in process depends on how the engine was assembled. Growing up I heard everything from 150 miles up to 2500 miles. I will admit that I heard about 500 miles more than anything else.
Although this is for a newer model engine, the general idea is the same.
Saturday, August 29th, 2015 AT 3:19 PM