Piston Slap?

[LongBaz463BHP]

First time on here and asking for advice. Recently fitted a turbo to my 5ltr Chimaera, did four runs up the drag strip, got a PB at 11.78sec. However when starting up the next day a I had a tapping/knocking from the engine,deffinately not bottom end, not on tick over but just on slight throtle at a stand still. Got home and changed the oil and it was as black as your hat. It was crystal clear before the runs down the drag strip. It does get quiter when warmed up, which leads me to think of piston slap. I did fit a new cam and lifterd before the turbo install and has done maybe 200 miles.
Any thoughts or advice where to go from here?

Edited by LongBaz463BHP on Sunday 26th April 16:32

[LongBaz463BHP]

Thanks for the replies, a compression/leak down test is to be done next weekend. I will report back with the results.
Barrie