Oh, I thought we were having a conversation. If you really think I'd overbore a 318 to 340 specs, you'd be wrong. And if you think.065 of an inch larger radius bore makes any difference in a street engine you'd be wrong. Can you disprove my general flow numbers?
Looking at this from another angle, what is the advantage a 273 has over a 318? I know I have torn lots of 273s down, kept the rocker assembly's and crankshaft, and thrown the rest in the scrap bin. All 2 barrel engines, no commandos