Originally Posted by scottydsntknow
Stroke has zero to do with compression.
Stroke has everything to do with compression.
Compression is the volume above the piston at BDC divided by the volume above the piston at TDC.
All other things being equal stroking the engine dramatically increases compression. However, you can use pistons with a dish or a short compression height so they sit down in the cylinder to increase the cylinder volume above the piston at TDC to lower the compression ratio.
You have to pay attention to what you are buying or you could wind up with so much compression that the engine won't run on pump gas.