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Originally Posted by Monster
Ted- I wasn't considering boring to 427, only that most recomend that when boring a 427 that a torque plate should be used because of the thin cyl. walls. My question was "is this a concern with 406 since it has thicker walls"?
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I mentioned the 0.100" cut only because some 406's can actually take it and have a better cylinder wall thickness than a stock 427. I've got a 406 service block that's like that. The '62 models on the other hand were not as liberal in cylinder wall thickness.
I still like to torque plate hone the cylinders as it does promote a quicker ring seal. Thicker walls do to a small degree help in retaining cylinder wall integrity during honing but torque plates still help. Another thing to keep in mind is if the shop that's doing the cylinder walls hones it fast or with heavy pressure, you can end up with egg shaped cylinder walls regardless of using a torque plate. This is because the cylinder wall themselves are not concentric or even in thickness and a heavy cut will create more heating at the front and rear of the cylinders versus the top and bottom. For this reason, I like a very light hone on a cooled block for the last couple of thousandts.