Ok, so my boss just had his 427 rebuilt for his corvette and its now a 502 with aftermarket, intake, carb, headers, heads, etc.... Well we were putting the engine in this past weekend and he said he was gonna run it at englishtown this weekend. I was like ya gotta break it in first. But hes tryin to say that the miles that the motor had on it before the rebuild count?
All I'm saying is i wanna be the one at Englishtown this weekend doing this >

and saying "told ya so"
So isn't there a break in period?