I recently found an add in Craigs List that had a 350 small block for sale for $65. I called to ask about it and the man says it runs. Of course I buy it. I buy this motor with intentions to beef it up and bore it out to a 383 and then put it in my '87 K5 Blazer. Here's the problem. I tore it apart and then ran the numbers. Its a damn 305 with 350 heads, valves and crank. But then I realize that it doesn't matter because I plan to bore it out anyway. I did some research and I keep hearing this roomer that you cant bore a 305 to something that size because the cylinder heads will be to thin. How can this be. I know for a fact that you can bore a 350 out to a 402. If its the same block then you should be able to do the same with a 305. Is this true? Its on the same block, what does it matter?