Originally Posted by
XRT_si
Standard 2WD Cossies slap from standard and I've heard JE pistons tend to slap after a few miles strangely, so the fact Wiseco are owned by JE is interesting.
JE/wiseco tend to slap because they make them from a softer material but people assume that they are just like any other forged piston.
They then machine the bore for a normal forged piston.
The end result is a bore that is far to big for the piston= piston slap.
the soft material combined with the over heating may have caused problems.