Well I'm not to educated in the internal workings and procedures but having been around gearheads my whole life I understand why the above makes perfect sense! I learn so much here
That's great to hear! We are continuing to learn stuff all the time.
More from the: "Things that make you go Hmmmmm", department...
By offset grinding the crankshaft rod journals, the stroke can be increased from the stock 440 3.75" to 4.0". Offset grinding does not remove an equal amount of material all the way around the existing journal. Instead, you are shifting the imaginary circle off to one side of the journal. The journal still ends up being perfectly round of course. As the imaginary circle is now "shifted" to one side, it increases stroke. Two ways to increase displacement: (Bore size and Stroke length). So increasing stroke from 3.75" to 4.00" with an offset grind jumps displacement from 451 to a whopping 482 cubic inch. However, this changes the Rod Ratio to 1.69. While this generally increases low end torque, there is more piston side-loading due to the steeper angle between the rod and the cylinder bore.
Our 8.3L engines have a 1.54 rod ratio which has more mechanical advantage at or near the top of the stroke and generally produce more torque because of it, but have considerably higher piston side loading, as mentioned. This topic can get quite involved as stroke and rod length combos are studied.
Anyway, Rod ratios around 1.8 are considered by many to be a good compromise. This is calculated by the rod length divided by the stroke. So... a 6.76" long connecting rod combined with a 3.75" crankshaft stroke ends up being a nice 1.8 ratio and is part of the reason many stay with a 451 cuber. Plus with some support equipment, they love to rev and are as tough as nails.
Longer connecting rods (stroke being equal) changes the dwell time a piston sees at the top of the stroke compared to the bottom of the stroke, where it now spends less time than it does at the top. This makes camshaft choice and ignition timing a study all it's own.
But back to the topic. Removing material from the CAST Main Caps and Block substantially reduces strength/integrity and in particular, is not for a higher horsepower build.
The End.
Maybe read this in sections in case your mind is glazing over and nap time is calling.
That's what happens to me...