I hope noone minds the resurrection of this thread.

this is strong candidate for a plan I'm working on.

If one kept the standard rods what would be the estimated reduction in
torque over the longer rods?

I noticed one post mentioned a 78MM crank, is there any other options
for added stroke if one was willing to clearance the case and such?

Would a different cam and tunable cam gear add any real torque to
cover the extra cost?

When refering to using stock engine components do you mean stock
dimensions or literally stock parts. If I went to Great plains site
and priced the lowest stock part would they be sufficient? No extra
cost pistons, stock cam followers, etcetera. The engine will be
balanced, utilize the HVX mods, and be a rear direct drive engine.