Knocking, pinging, and detonation has nothing to do with the engine itself. If the fuel delivery is not properly tuned any engine will ping, knock, and eventually melt a piston or two.
Moreover, m42 is a very good engine to turbo/supercharge because it has a forged crank. All you need is some low compression pistons and a couple more internal items here and there. Then 250rwh is easily archivable.
[quote]Originally posted by BladeRunner
[b]I thought the M42 was not the prefered motor to place a supercharger/turbocharger onto because of knocking, pinging, and possiblity detonation (or explotion), or is it certain years of the M42 are ok for FI.