Hi compresion - Spada

Hi all ref Spada Engine
Just noticed that you can get high compression pistons for the Standard Spada engine
Are these a straight replacement or does cam / valve work be required to maintain piston valve clearance

I saw that too read in Guzziology, I dunno BUT I suspect ed at Reboot will know…not sure if it will make a massive difference tho mate.

Le Mans 1-2-3 has domed crowns but std cams