Originally posted by Blazerteam
I don't have any experience with a 4" bore 406 other then to say it's already a PITA grinding a 350 block for a 3.75 inch stroke crank, I wonder how much pan rail would be left on the 4" stroke version.
Windsors get a way with 408's all the time but they have a 9.5" deck and swallow a 6.2" rod giving it good geometry, the chevy with a 4" stroke and a 5.7" rod you're looking at would have worse angles then a 347 ford which were all the rage before people kept popping them and going to 331's. A 4" stroke and 5.7" rod would even be worse then the factory chevy 400 with the 5.565" rod. You'd have to go to a 6" rod to get mediocre geometry but that's going to push the ring pack WAY up on the piston (only an inch of room). That stack height will probably burn some oil.
I would keep life simple and go with a 383 with 5.7 rods on a 350. If you can't live without at least 400 cubic inches, go to a 4.125 bore block.
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