Important distinction here... Nickel makes it harder, not necessarily stronger. Its much like the debate between hypereutictic and forged pistons. If I'm building a high-rpm screamer, I'll chose a softer block because it can absorb more impact than a harder/more brittle block. Completing the analogy comparing this to pistons, forged pistons are stronger, but softer. They will deform and absorb more shock before failure. Cast or hyp pistons actually have a higher yield strength than forged, but when they go, they GO... like shatter.Mustangsaly said:I thought a high nickel block was desirable cause the tin helped the melting metal flow in the casting better to forge a stronger block and the nickel made it stronger.