I would guess somewhere around 7k rpm, as the fasteners are not the real issue, it would be the balance of the assembly and given the not as good geometry of the 9A, I don't know how far you would really want to take it. With a balanced assembly, more is possible and then other things begin to limit rpm, like the head's flow and the cam's power curve.
Last edited by Rocco R16V; 04-22-2012 at 04:10 AM.
Thank you to the last 2 guys.
the engine will obviously be broken in. It won't be seeing north of 7 on a regular basis, but i know the cams are good to around 8, so once in a blue moon if i hit 7500, i don't want the thing shooting rods through the pan.
Up and Atom!