I was talking to the machine shop today and ask how much he charge for Magnafluxing , so his reply was $40.00, After a pause he said he could Pressure Test the block for $70.00. What is the difference between the two and which process would detect a crack or bad block with the most accuracy.
Thanks: David

 

Both have their advantages. A pressure test won't tell you about a crack that isn't leaking and having the block mag'd might not show a crack where you can't see it.

I've come to a point where I use a shop that does alot of high end work and I trust so I drop off my parts and have them call me with the bad news, then we go from there. I don't tell them how to go about their jobs, I simply say to check the parts and call me. It's the shops job to make sure that when the parts come back to me they're ready to go and 100% usable. It may not work for you doing thigs this way but it does for me.

 

preasure test would only show flaws coming from or going to water, mag wouldn't matter but is limited to where you can see and have access.