“grunt”…. So the word implies low end torque?
“Putt putt”… not sure what that means… possibly lugging it around town… no racing?
94mm seems to be an acceptable overbore.
If I were going to do that, I’d have the block sonic tested and magnafluxed. I’d keep the compression 9 or below.
That much overbore will increase the power. There is a list of optional mods and parts selection that I would carefully consider.
I’d have a conversation with Jim at 22RE Performance and one of engine builders at LCE to get their input.
I don’t know if there is any kind of non-manageable cooling issues with the thinner cylinder walls?
I would weigh the cost of a big overbore for power gains vs. other optional modifications for power gain.
With a big bore will a ported head, larger valves, and a torquey cam be an important complement?
If I took a factory stock 22R and bored to 94mm and rebuilt back with no other mods, I’d get about 7 lbs of torque and a 2 HP gain. In my experience, 7 lbs of increase torque would be noticeable.