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Original Message
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RE: 3/16" is a lot. |
By Geoff McNew - 11/30/2003 9:30:58 PM; IP 66.52.140.133 |
From FE books and previous posts here by fella's like Shoe, I always understood 15/64" to be the "magic" number. That is, if a 15/64" drill bit shank will fit between the jackets, it's a thin wall like for a 360/390. Conversely, if you can't manage to get a 15/64" to fit anywhere between, then it could be a 428 or 391, and it's worth further examination like sonic testing. I guess the long and short of it is FE's are "thin wall" castings and it doesn't take much core shift to screw one up. |
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