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Quite a few comments on the 4.6 and 5.4 blocks. The first aluminum cobra blocks were manufactured in Italy. Ford later changed and lightend up the blocks and added ribbing in order to keep the strenght. The later blocks were not as strong, even with the ribs.
By filling the water jackets, they were taking the early blocks to 1500 hp. I will have to pull Sean Hylands book and re-read it, in order to get my facts straight. These little engines have been quite impressive.
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