[Jim Brierley]

First remove the fan belt to see if that helps. The best way to balance the pistons and rods is with a balance-beam scale but the Post Office sells a good digital scale that reads in ounces and/or grams. 1 gram is the weight of a dollar bill, not much but try and get everything that close. Balance both ends of the rods separately, and total weight. Pistons without rings, pins can be used to make a little difference in piston weight by switching them around. If inserts, don't include them, rings and insert bearings will likely be replaced at one time or another, and weight difference is so little it won't make any difference. Crank, flywheel, etc. should be done professionally. Good luck and have fun