changing radiator coolant 4.6 V8

The only way you're going to get all the coolant out is to remove the block drain plugs. (They're 17mm). Don't forget to open the cap on the coolant overflow/reservoir. You could also bump the starter or run the motor for a few seconds so the water pump pushes out some coolant too.

Thanks Ken, that is what I was fearing. Both my plugs are the type which are removed via a 3/8 inch square socket extension. Ford mechanic stated even going that route I will only get about 13 quarts out unless I remove the engine from the vehicle. Wonderful design.

drain radiator and flush with water for 15 minutes then let drain till empty as poss plug refill I used 7 nqts anti full streanth and water the rest.will check for 66/ 44 ratio max after it mixes up driveing.A few quarts in block so full strength to get perfect 2 gal anti freeze almost get 15 year prestone good for 350 k got 21 years m out of factory