Quote:
Originally Posted by Pursellauto
Here is a major difference in the block of the 305 and the 351. The 305 has a stud in the block on the right side near the timing cover that the motor mount bracket fastens to. The 351 has a pipe thread fitting in a hole in the same location.
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The 305C will also have a threaded plug, it's not so much the difference between displacement size but what application the engine is for, I have a 351E with the stud on the side of the block.