340 Block Cost

autoxcuda said

where is the 340 thicker and stronger?

If so, at what power levels will that be significant?

My understanding was the 0.020” increased bore radius slightly un-shrouds the valves more for slightly increased head flow. I’d think this may be pretty minor on street engine with 2.02 valves.

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I've also sonic test measured some early 360s and a couple of 340s. They were pretty consistently thicker than the later blocks. Not by much, I admit, but they were. I don't think there's enough difference to warrant the "myth" that the early engines are thicker to the point that they actually are stronger enough to matter, but I do believe there is some merit to it. I think it's something that should be handled on an individual basis and not just a blanket statement made. I didn't mean to go that direction.