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Original Message
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| RE: 427,428,429 Trivia Question |
| By Will - 11/16/2000 1:59:37 AM; IP 64.154.229.236 |
There was a long thread on this on one of the other forums.
You can't simply do the math, because the 427's had different bores depending on the quality of the casting (that's what the thread said, anyway) Also, the older engines used 3 significant digits instead of two, so instead of the bore being 4.23, it may be 4.235 or 4.237, etc.
If you use 4.230 * 3.784, you get 425.4, but if you use 4.239 * 3.784, you get 427.22. I don't know how large they would bore/hone the 427, so maybe they chose 4.235 * 3.784 when they decided to call it a 427. That would give us, 426.41. Oh yeah, another bit of trivia is that the common engineering practice was to round up when sizing engines, so 426.41 becomes 427, not 426.
If you use 4.13 * 3.984, the 428 comes out to 427.07, but again, rounding up, you get 428.
The 429 is a little different, because it only uses 2 significant digits on the bore & stroke, so it should be 4.36 x 3.59 or 428.79. Rounded up it's 429.
I doubt the 427 was called the 427 so it wouldnt' be the same as the 426 Chrysler. When did Chrysler come out with the 426 wedge anyway. Didn't the 427 Ford come out first?
I make no claims that I'm right on any of this ('cept the math). I'm simply repeating what the other thread said. |
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