block
If you can find a nice cube van block or truck 1 ton and over use that. Usually the vortec block has no provision for fuel pump, but these have been found with 4bolt main and mechanical fuel pump pushrod holes machined and everything. I have a block like this and on a scale with no main caps, it weighs 15lbs more than the standard 1/2 ton block with the same casting #'s. When sonic checked the main web is thicker and the cyl sleeves are usually .040 thicker as well.
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