Im running forged Weisco 9:1 pistons and eagle rods in a B18C1 / ITR head combo the head is stock.... and this is how my car sounds after 1hour of driving I was told that forged pistons are loud at start up but should quiet down as the car warms up, could this be piston slap? bent valve?? my itr sounds like a diesel truck
download the video below (Right click and save as)

http://65.49.87.73/MotorSound.avi

I have done a compression test and all cylynder's came up with 180 accross now the question is would I get piston slap and still have 180 compression across?

 

yeah that sounds like piston slap, it should get quieter when the car warms up.were the tolerances from piston to cyl.wall ok?
does it sound lauder when cold?