actually the 4.6 is a very strong block in iron form all you need is some froged internals...a cobra crank,rods,forged dished pistons. You should here the stories of the pushrod guys cracking the stock blocks left and right under low boost let alone. When building a custom turbo setup the pushrod guys always put a aftermarket block on the list. The factory iron block has seen some major power levels no problem. Not to mention that some guys are boosting stock PI motor to the 400-450Hp mark!
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