The only thing stroke is good for is moving your power range around. The more stroke the more you lower your RPM range.

However bore is more beneficial for making HP. If the bore is small such as 4.100 with a W9 head you sacrifice head flow from shrouding the valve. 4.155" will work but I would go bigger.

Leon

Career best 8.02 @ 169 at 3050# and 10" tires small block power.