Chevrolet Repair: Engine coolant petcock - 1991 Chevy K2500 4x4, engine coolant, coolant system

Question
To flush the engine coolant system, the Chilton manual says to open the petcocks on the radiator and engine block.  We found the radiator petcock, no problem, but can't find the petcock to drain the engine block to save our lives.  Help!

Answer
Hi Jennifer.... and you won't find one ... best thing to do is drop lower rad hose....fill engine and rad with cleaner, start and allow to get hot then cool off and drain by repeating process, leave lower hose off and flush out with hose...reattach hose and refill.. hope this helps