That the the question I have. I have an 01 XJR. I know the s type R 4.2L have forged internals, I haven't seen anyone ask about the 4.0L or maybe I didn't search enough. Can someone answer that for me. Thanks ahead of time

 

4.0SC engine has not forged internals ( sintered rods ) . 4.2 has forged pistons and rods.


"To match the increased output and the increased mechanical and thermal stresses that supercharging imposes, the new XKR V8 has stronger pistons,forged from single billets of aluminium alloy. It also features oil jet cooling on the underside of the piston crowns, for maximum cooling and minimum distortion. " XK8 Lovers - Models