I've been racing for about 9 years now and just recently blew my first motor.I got the car turn key back in Dec. And just a month in a half ago gotr a chance to run it.I was told it only had about 40 1/8th mile passes on it.The 3rd pass the #6 rod came out of the side of the block.And this motor had good stuff in it.Luckily the $4000 heads didnt get hurt I just piut on it.
So you don't really know what your getting until you blow it.Just ask alot of ? and ask for reciepts on the motor if they have them.