Reply to "Drilling drain holes..."

Besides the 1/2" subframe holes that were recommended in the '70s, I add a 1/2" hole at the very base of each upper rear a-arm support- the so-called 'horseshoe' stamping. Drilling a hole at the bae of each leg invariably gets a fine stream of rust and dirt out. For those who live in moist areas, we used to cork up drilled subframe holes, fill the rails with drain oil, let the car set for awhile then pull one cork and let the excess drizzle into a pan over a day or so. This coats the unseen areas and really protects the rails.
FWIW a leaky rad cap will drain water down the tank, down the fender panel directly into the right side frame-top opening. Driving in wet weather will also FILL both frame rails with water if they're not drilled; I've demonstrated this to many owners by having them stick their finger in their car's frame opening; invariably there's wetness felt inside.