Originally Posted by DirtyD
People have held the blocks to 1000hp levels without much issue.
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Just because a few people have made 1xxxhp for a couple of dyno pulls and then turn them back down for normal driving conditions doesn't prove anything. Kevin and I spoke with a couple of Ford engineers at SEMA about this and they admit the factory block isn't up to the task over anything 550rw+.
The fact is, the blocks are not up to the task of that much power on a regular basis and many, many people breaking them at 600rw on a normal basis only further proves that point. And honestly, it shouldn't be up to that because it wasn't designed for that, it's just that us car guys push the limits of our factory set ups beyond their designed for limits.
The motors are very light, very efficient, making great power for only 302 cubic inches. They are great for N/A sub 550rw power, no doubt about that. But anything more than that you are asking for a blown motor.