318 vs 340 Questions

Getting back more in line with the OP as I didn't see any mention of strokers or fuel mileage. If the performance of a 318 tickles your fancy by all means go with it, but if you want more rebuild the 340. The parts cost the same and the 340 will the 318 in every way. The 340s larger bore allows for larger valves but more importantly better cylinder filling.

Apparently I have a different take on performance than most on here. IMO when it comes to CI more is better. I've had 273 commandos, 318s, 340,s, 360s and can tell you this, 273s and 318 are anemic compared to 340s and 360s. There is a reason Chrysler NEVER put a 318 4bbl in a muscle car.

As far as fuel mileage is goes, if you are concerned with it buy a Prius. I built a bunch of small and big blocks over the years and never considered fuel mileage. My goal has always been to make them run hard for what they were. I guess I'm one of the dinosaurs that likes to build and drive fast cars so my perspective is skewed.

Good luck guys.