I am somewhat ready to start building an engine for next year, dug out my other 428 block. I knew it was not in the best of shape and it wasn't.
But I had a early 60's 391 block that I had used as a dummy building the T-Bird.
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I had chaecked it with drill bits and it was the same as my 428 block so the only question was core shift, if there was any and how much.
So I took it for checking and got some numbers. I only had the thinnest section which is where the 2 cyl casting meet and the draft angle is the smallest. Concentrated on the thrust sides. Checked a couple front to back to check core shift. I beleive I have a fine example of a block and a good core to start. Doug who checked felt the lone .157 number might be wrong, he had a hard time getting a reading the number does not make sense compared to the rest.

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Time to start deburring, drilling, filling blocks and crossbolting, YAAHOO

......The reason I ask is that the Bore Cores and Water-jacket Cores are each molded as one integrated piece (4 bore cores on one 'plate', which becomes the deck), the Bore Core is set in the Drag Mold with the Water-Jacket Core placed over it and just a nudge from a worker, or from placement of the Cope Mold, could damage the Water-Jacket Core to be moved inward resulting in the .157 measurement. Since the 4 Bore Cores are molded to a connective plate, the end cores are likely to show a splayed/compressed value in any direction if detached/broken before the pour, JMO, Rod.

Mickey Thompson's 63 1/2 #997 S/S Hi-Rise 427 Lgt/Wgt Galaxie,
1957 C-600 Cab-over carhauler w/390-4V, 2-speed rear-end
FGCofA member #4908
MCGC member #75

"There will ALWAYS be an FE in my LiFE"

So basically will remove .050 from each side of the cylinder, bores are at 4.05 now.
Leaves .100 in the thinnest point, block will be cemented so even if the .157 is accurate I do not see any issues with using it.

Is it at 4.05 now and are you going to bore it .080 to 4.13? Or is it at 4.08? Are you going to 4.16?

And make it 4.150 (.020 over 428) or a .110 (.030 over 428) and that would be 4.160. Also he said its a 361/391 Bore size from the factory would be 4.05. Unless he didn't measure the bore but I bet he did!

"The Poor Mans 427"
http://www.fordification.com/poormans427.htm

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Wes Adams FORD428CJ
Built Ford Tuff With Good Ford Stuff
79 F-250 X-Cab 4x4 with a 6.9 Turbo Diesel
64 Falcon X-Ram 428
55 FORD Truck 4-link Rides on air with X-Ram 428
2000 Yamaha V-MAX VMOA#4277
2000 Yamaha 700 Mountain Max
2001 Polaris 600 Edge X
2001 Polaris 500 SP