ok i have like 464 miles on my new 355, and i have been told that at 500 i can drop the hammer and i have also been told that at 1k i can, now the only problems that i have is a dam exhaust leak which is getting fixed like yesterday. so what do you all think, thanks for any help

Shean

 

How you break in a new performance engine requires just good judgement on the drivers part. For starters I would not be Hammering it all day long a 500 miles.

 

I would ask your engine builder. Also I would wait for at least 1000 before I do WOT all day long. A few WOT blasts is ok but I would not get carried away.