Cleaning out a cast iron block
This is my second season with my '84 Allegro. Bought it with a blown engine. Put a Craigslist-found 454 in it (truck spec GM Performance crate engine). When I got the engine home, put it on a stand an...
Forum Discussion
The absolute BEST way to clean the block is to remove it, strip it down to the bare block, including removing all plugs, and put it in a hot tank for a day or so. Then steam clean it thoroughly.
Then replace the cam bearings (the hot tank chemicals will eat them), install new plugs, hone the cylinders, and reassemble it with new rings and bearings.
while you are at it, might as well strip the heads down and soak them, too, then do a three angle valve job.
Since you probably don't want to do that (I wouldn't), get the best, strongest, cooling system cleaner you can find, and follow the instructions to the letter. The stuff will probably be caustic, so following the instructions is a MUST DO!
Good luck.
Then replace the cam bearings (the hot tank chemicals will eat them), install new plugs, hone the cylinders, and reassemble it with new rings and bearings.
while you are at it, might as well strip the heads down and soak them, too, then do a three angle valve job.
Since you probably don't want to do that (I wouldn't), get the best, strongest, cooling system cleaner you can find, and follow the instructions to the letter. The stuff will probably be caustic, so following the instructions is a MUST DO!
Good luck.
