What is the largest over bore you can go on a 402

[nuch_ss396]

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Yes, I've seen the older 396 blocks go 4.25, in fact in early 1966 the 396 block # 3855961 was bored to a 427.

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It was my understanding that some early 396 blocks had thicker
walls and as such were able to be bored to this extreme.
Since the 402 was a 396 +0.030 anyway, aren't you already
behind the 8-ball regarding cylinder wall thickness? Or,
were the 402's cast with thicker walls to compensate for
the overbore ( 402 vs. 396 ). Remember, the 3969854 block
started life as a 396 ( late '69 production ), then morphed
into the 402 in 1970. I would tend to believe that the
cylinders wall thickness was not modified once 402 production
came to be as this would have mandated a different part number.

Steve