ab1;102740 wroteanything i can do to improve the integrity of the radiator if thats the case?
Swarf floating around in the system
shouldn't cause any issues. Most of it would either fall into low velocity points in the system and stay there or be caught up on the high side of the radiator until they corrode away to nothing. Oil galleries are a different kettle of fish, fine stuff will make it's way into bearing journals. Large stuff will just move to a point and stay-put.
Just shove the air gun into as many holes as you can and from different angles. Use a light.
Vee_Que;102742 wroteDon't confuse the guy. He's paying a workshop to do the lot. It's all going to be fine.
What he does with his car and his money is his choice.