Hi Brick-
Yes a 351-C can be sleeved but for best results (and longevity), only sleeve ONE cylinder on each bank of your V-8. This is especially true if you plan to upgrade the power of your engine. The bore for a sleeve will fall through most cylinders on at least one side, but the critical area is the bottom of all the bores. The boring further weakens the main bearing webs so the engine shop should use minimum-depth sleeve bores and minimum inteference dimensions, with sealant.
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