Un-stroked vs Stroked Displacement vs. Crank Angle, etc.

If your going racing for big bucks, then this stuff becomes important to you and the cars performance on a specific track for a specific reason. And there is some good in it when you start splitting hairs and such when looking for that certain something out of the engine and car.

On rod Length, it has been a debate on what length to use for the ratio sought for the engine. IIRC, MoPar likes a long rod in the drag cars. This is where the 340 becomes a favorite of the company to run. A good example is there 440 create engine that stills runs a 4.00 stroke but makes up the displacement through a huge bore size. Which also has big bennifits. Going this route, bigger bore for the 4.0 arm crank helps limit the rod angle from being to severe. This, in there opinion, is the way to go. I like it myself.

For us street bound guys, big bore from a stock block just isn’t possible. So we go to a larger stroke. 4.15. 4.25. This increases the angle and side load.
But it will give you the inches your looking for. Also, 99% of the street guys have a limited budget. Let’s be honest. You don’t have $100,000 to play with on just an engine development team. The plus side is more torque power at lower RPMs rather than higher RPM for HP. In the street, this is good.