there may not be one if there is it is on the bottom if not you just remove the bottom radiator hose to drain
Bottom of radiator on driver side. open radiator cap, and turn drain plug at bottom counter clockwise, you should see the water/coolant drain out. Once empty, place water hose on radiator and let it flush for a few minutes or till you see the water come out clear, shut off the water, let radiator drain, screw drain plug back in place and fill radiator with a mixture or 50/50 water/coolant.
Pretty much a bolt in, you will need motor mounts for the 400 Pontiac, the transmission will bolt up since Buick, olds, Pontiac have the same bellhousing. I have found headers from a 1968-1972 GTO will fit with some slight mods. I helped a friend install a 400 Pontiac in a 1981 Grand Prix that had a 231 V6 some years ago, was pretty straight forward. Only real problem we encountered was the car overheated with the thin single row V6 Radiator, that was easily solved with a 3 core radiator.
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