Undersquare vs. Oversquare Engines

rumblefish360 said
Why does the longer throw of the stroker crank have no advantage?

How does the Sb stroker not have the ability to rev like the B.B. 400?

Even though it was a Chevrolet motor, the engine Masters episode of the 383 stroker first at 400 B block was very good.

The reason the 4" doesn't have the advantage over a lesser stroke. Especially in this comparsion because of different bore size. It the 400 bb has more piston area then the 360/408 sb so for the same amount of fuel being burnt the 400 bb will have more downward force going to the crank than the smaller bore sb. So the 4" stroke will be multiplying lesser downforce than the larger bore bb which means both should put out about the amount of torque for a given revolution.

But in the case of the 360 3.58 crank vs 408 4 crank. They both have the same bore size, there for the same downward force. So yes the 4" stroke will produce more torque at a given rpm. So the 4" stroke only has an advantage at low end power, but that only matters if deep gears and high stall is an concern. But if you factor in piston speed the 3.58 can always spin faster than the 4 always able to make up the difference if your willing to spin it. So bore size really becomes the limit, cause bore size limits valve size which limits airflow which limits hp. Obviously for this to matter were talking about taking things to the max.