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Be wary of truck blocks unless you're planning on building a blower motor. They have 2 fly-cut wedges removed from the combustion chamber to lower compression to about 7.5. You can't make that up with different pistons.
Verne
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Won't most of those fly cuts go away when the block is bored?? A picture would be nice. It would help i.d. a truck block if I were to see one apart. Are those eyebrows in the last picture what you are talking about?