I've heard of going .060" over, but most builders feel .030" over is the limit.
A small block Chevy has a 4inch bore. When you bore one 30 what you are doing is removing .30 thousandths from the cylinder. That would make the bore 4.030 or turn a 350cid into a 355cid.
get a big block or bore it 54 over
4.165"
4.155"
421 c.I.d.
You can bore a 350 .090 over, but the thing is the bore is so big that the cylinder walls are about a hair line thickness apart. In order for the engine to accept the bore and punishment of the shear power, the 350 Block must be casted with extra carbon to strengthen the block.
any Chevy 305 block can be safely bored .060 over. if you have a good block, with thicker cylinder walls, it might be .080 borable.
The 350 has, over time, been the best, most versatile, small block, ever.
A 355 is just a 350 bored 0.030 over. There really is no difference. this is true but to further the answer if only you bore the cylenders out in the block you will need to buy aftermarket pistons to make up for the new wider space so you dont have compkications with the pistons slapping the cylender walls
The 5.7 heads will work if they have the smaller 184 intake valves . Or you will have to bore the block over to get the 194 ,200,or 202 intake valves to fit into the cylinder if not it will lock it up when the valve opens and hits the edge of the block
4.310
350 block, 400 crank. Main journals must be turned to accept 350 bearings. Stock bore is 377. .030 over is 383.