Once you get all 4 rods to fit perfectly, you want to spin the crank by hand about 20 times and keep re-cheacking. OK, now your happy that you have not assebled a bomb, lets start looking at clearances that are measured without a coat hanger. Start with the easy one, rod side clearance. Get a feelers guage and push 2 rods to one side and measure the gap on the other side. Like this: