Water Jacket crud buildup

[72shortbed12]

I have a 350 out of my 71 I'm swapping into my 72. It was a longblock I bought 7 yrs ago, put 15,000 miles on and then tore it apart to start doing a basic restore (that isn't done). Its sat for about 5 yrs now and I've gone out and started it about 4 times a yr. When I went to pull it I found the radiator has a pin hole and leaked out more than half the coolant. When I drained it it was brown and a lot of buildup came out. Now I have buildup in the water jackets in the heads, intake, and I'm guessing the block. Its not horrible but I dont want to have crap plugging up the radiator. Should I just use some prestone flush treatment or is there something better?

Thanks

[vectorit]

Some of the cooling system flush formula's are supposed to be really good for hard core build up, but in my case I was able to take care of my cooling system sediment issues with doing a couple flush routines.

I've heard some of those flush formula's can be kind of harsh on the cooling system parts, so I am sure someone will chime in sooner or later with their personal experiences and recommendations.

BTW: Be really careful with the flush and the coolant waste, since it is poisonous and pets like to drink it.

[Longhorn Man]

the prestone is the best on the market acording to our rad shop at work, even that though, doesn't do much.
If the engine is out, put it on a stand, pop the freeze plugs off, and stick your fingers in there. If it's real bad, it'll be packed in there like mud. Start fingering it out. Then, use a hose and spray nozzle to flush out as much as you can. If you have a pressure washer, then you can use that after you dig/rinse out as much as possible.
If there's just a little sediment on the bottom, then a hose or pressure washer will do.