Join Date: Jan 2001
Location: Lubbock, TX USA
Head to your local home improvement store and pick up a good spray bottle and a gallon of Hydrochloric or Muriatic acid (same thing). Put the block on an engine stand and in an area that is well ventilated and it doesn't matter if it drips. It helps to let the block set in the sun and get heated up. Don't do it on a day with any wind or you may end up getting the mist on you or breathing it - not a pleasant experience, I can tell you for sure. Spray it with the acid and let it set awhile. You can respray as needed in the toughest spots. Rinse thoroughly with water and spray down with WD-40. This tends to give a block a greenish tinge due to the traces of different metals in the cast alloy. The other option is to get a large plastic drum and cut the top out, fill about 1/2 way with water and add 2 - 3 gallons of acid and lower the block into it, then fill until it just covers the top of the block. This gets inside and outside, but the drawback is you can't rinse inside all of the passages with just a hose - it needs to be dipped a couple of times in clean water to neutralize the acid completely. Unless you leave the acid on the block for an extended period of time, it won't hurt the metal and it will look like brand new when you're finished. HTH
FCS Harmony Racing
Momma always told me not to look into the eyes of the sun.
"But momma, that's where the fun is!"