Do a sonic test on a standard bore 400 and 350 you will find they will have similar cylinder wall thickness and not having a “thicker” wall on a 350 block.
As mentioned above the 350,400 & 455 all had there own separate castings.
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1994 Formula
535ci NA CV-1 - single 1050 with c14 - 940hp@7000/825tq@5200
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