I was running an HJR aggressive dune port with stock carbs,pipes and head...I pulled the crank to weld before doing more mods and it was already showing signs of pulling apart...and I know for a fact it was a used but low millage well taken care of quad...but then again...Kevins porting puts out POWER...even with stock pipes,carbs and head!
So yes...pull the crank check the tolerances and weld it up...