Mild 383 build

Turk,
I will answer your question first. Post #98. Both engines will make the SAME POWER.

That is because both pistons have the same total force applied [ 100 lbs ] ; what will be different is the lbs per square inch. The respective areas of a 4 & 5 inch piston are 12.6 & 19.6 sq in.
The pressure on the 5" piston is 5.1 lbs/ sq in; on the 4" piston it is 7.9 lb/ sq in....which adds up to total of 100 lbs. Any other scenario would mean energy is being created.....