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4.040". The standard bore is 4.00".
333
302
That would be called a Chevy 307 bored .40 over.
408
If my math is correct , almost 410 cubic inches ( using a 4 inch bore and a 4 inch stroke that has been bored out .040 )
It's a 327 with cylinders bored .040" over stock.
4 to 8 degrees before top dead center
They only make 1 size head gasket. It don't matter if it is 10 20 30 40 or 60 over the factory head gasket will fit with no PROBLEM.
Here's quick easy and simple answer 350ci is the total volume of all eight individual cylinders of the engine in cubic inches added together 350ci divided by 8 = 43.75ci volume per cylinder bored .040 over which means forty thousands of an inch overbore means that you enlarged the entire bore from top to bottom by forty thousands of an inch over it's entire circumference the reason it is done is because the cylinders have worn to the point that even with new piston rings the tolerances would be out of factory specs. so you bore it out .040 then you have to buy new .040 over pistons and rings then do everything else you need to do to put the engine back together and you have a Chevy 350 bored .040
.040
The 351M/400 engines have "thin wall" castings and can not be safely over-bored beyond .040". This is probably the only real drawback.