Your pretty much gonna have to retorque any lowers. I usually put a little bit of silicone around the water jackets on my 1250s then bolt it all up. Run it through a few heat cycles and then a retorque while it is warm. I end up going over all of the bolts several times since it seems that as you torque the manifold the added bolts reduce the amount of torque you put on the previously installed bolts. Usually take 4-5 rounds of torquing them down til they are all set.