a Chevy 350 bored .060 over would be 360.4 cubic inches
You need to call a parts store and tell them that you need a set of 0.30 over file fit rings.You need to ask the machine shop that bored the engine,what size he bored your engine. It may be 0.30 over and you won't need to file fit the rings.If it's 0.029 over then just file fit a set of 0.030 over rings.
Each cylinder has been re-bored to a diameter .030" larger than it came from the factory. .030 oversize isn't much. It's done to correct slight cylinder tapering and to put the engine back into condition that it will last. It really isn't enough size difference to produce noticably more horsepower. Note that when the cylinder is bored .030 over, you'll also need pistons and rings that are manufactured to that size.
283 bored .060 over should b abour 292 cubics A standard bore 283 was 3.875", so 60 over would be 3.935.
4.040". The standard bore is 4.00".
A Chevy 305 engine bored .040 over would typically be referred to as having a +.040 bore, indicating the increase in bore diameter from the standard size. This modification can increase the engine's displacement and potentially enhance its performance.
A 350 starts out with a 4.000" bore and a 3.48" crankshaft stroke which really only gives you 349.8 cubic inches. (Chevy rounded it up to 350) Your engine which has the same stroke of 3.48 but now is bored .030" over (making the cylinder bored size now 4.030) total size of 355.1 cubic inches or just a 355.
It means that the cylinder has been bored over what its original size was and now has a larger piston than what it was originally manufactured with. It means a slightly larger displacement than before and most times gives more power.
One would use over-sized pistons and rings (TOGETHER!) when the cylinder has been bored to accept the next size piston. For instance, damage to a cylinder wall may necessitate boring the cylinder an extra 0.020" (twenty-thousandths of an inch). You would then use a piston and ring set that was 0.020" larger than the originals.
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NO, the pistons and rings must be correct for the bore size. Example: Your 302 Ford bored .050 has a 4.050 bore so it would need a piston ofapproximately 4.046 (forged piston) for a clearance of .004 your piston being .010 too small would cause .014 clearance and massive blow by, oil fouling of the plugs, piston noise, scored cylinder walls, poor performance, and VERY short engine life. Get the right parts, do it right the first time, it is cheaper in the long run. Also if .010 over rings are used in a .050 overbored engine your ring gap would be HUGE! You cannot "add up" the two spec. You need +.050 pistons and +.050 rings. Please note if you are using cast pistons you can run tighter (smaller) clearances than in the above example. The best method is to have the block bored after you have the pistons, so your machinists can measure them and bore/hone to the exact spec. If your block is already bored and you know the EXACT bore measurement, order them from a reputable piston manufacture as most are pretty accurate now days, just make sure you double check the specs when they arrive.