Block drain petcocks are usually clogged with sediment. You can take the petcock out and clean out the sediment with a stiff wire.
Best way to flush is to remove the thermostat or bypass hose so water will free flow through the system with the engine running. Hang the garden hose in the radiator, open all the drains, start the engine and run it up to speed with clean water going in and the dirty water and vinegar being flushed out. When it runs clear water, usually about 15 minutes of flushing, turn everything off, replace the thermostat or hose, let it drain, and refill with 50-50. Or use straight antifreeze and distilled water.
But, if it was full of rust, expect to have to repeat soon as there will still be rust in the bottom of the block. It may or may not stay settled, depending on how bad it got.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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