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FE Technical Forum / 63 427 block sonic test
« on: August 09, 2021, 10:06:10 PM »
So I've been told the early 427 blocks had thicker cylinder walls. Recently I had a chance to use my ebay special $100 sonic tester. Have to say once found the right coupling fluid (used dielectric grease) and got used to how to use it I could get very good and repeatable reading. I used the china wall as a check both before and after sonic testing the block. Was impressed it read the china wall within .001" of what I measured its thickness as being.
So this is a an early 1963 427 block C3AE-6015-AB and is currently standard bore. Other than some core shift on cylinder 7 I was surprised at how overall thick this block was. I know a sample of one cannot draw any conclusion as to how the rest are, but I'd say this one at least did not disprove the theory that the early 427 blocks are thick. Anyway sonic sheet is attached. Steve
So this is a an early 1963 427 block C3AE-6015-AB and is currently standard bore. Other than some core shift on cylinder 7 I was surprised at how overall thick this block was. I know a sample of one cannot draw any conclusion as to how the rest are, but I'd say this one at least did not disprove the theory that the early 427 blocks are thick. Anyway sonic sheet is attached. Steve