opinion about this block

[Emo1956]

How many know why or how this block come to look like this ? This may be a lesson for some of us to learn. I tried to make the area as big as possible

[x66 714]

They might want to see a picture of the entire pad as well as this picture....Joe

[69Z28-RS]

How many know why or how this block come to look like this ? This may be a lesson for some of us to learn. I tried to make the area as big as possible

I suspect you meant that you made it as 'enlarged' as possible?  rather than a large area?

I'd want to see a non-zoomed image as well, but from that photo the metal appears to have been 'blasted' (sand blasted or ??); perhaps in attempt to remove surface rust?

Can you provide more information about the block, the image, and why you are asking??

[william]

I have a pic of a V0218DZ stamping with an LA VIN that compares well with other February DZ stampings.

The stamping posted here does not match up.

[Emo1956]

Well what happen is I had the block burn blasted and I after I saw the block I took some pics to show to everyone what had happen. They has just changed the shot in the machine which I didn't know would do this to the block ! It beat the hell out of the block ! The block looks nice but the pad took a beating as well. I think a lesson learned to ask before you have it done.  I will have to ask if there is some way to cover that area before they blast it with the shot. I can kinda see the broach marks left but its hard.

[dannystarr]

Looks like a high pressure sand blasting to try to emulate factory broaching. Doesn't look original to me. Problem they didn't realize was, some of the blasting got in the letter areas. And that would not be the case if it was an original stamping. Block would be broached, THEN stamped clean. At least that's my opinion... Danny

[dannystarr]

Whoops, it said someone was leaving a message at the same time. oh well.. Danny

[Emo1956]

I have no idea where this block came from. Its been in my pile of blocks for  a very long time. Over 35 years. I matched it to other pics I have of DZ blocks. All nor. I think.

[Emo1956]

This is another block I had done. Lesson learned  ! The reason I am posting this pics is for others to ask before you have your block done and you can see what happens . Not trying to hide anything before everyone goes off the reservation here !!!!

[maroman]

I have always wondered how much the block moves around from being heated then blasted with shot like this. Has anyone ever taken real measurements, especially line bore,  after having this done?

[69Z28-RS]

I'm not sure what 'burn blasted' is...  Can you explain?   You also mentioned 'shot'...  Is that a shot peening operation?

PS.  If you are having an 'antique/collector' block machined *(or burn/bead/peen blasted) I would suggest using a high grade/thick tape (duct tape) maybe a couple of layers over any machined surface you want to protect (ie. the pad on our Chevys)...   When I took my DZ block to the machine shop (over 40 yrs ago), I put a double thickness of duct tape over the stamped pad, and wrote (DO NOT REMOVE/DO NOT MACHINE)... I told them if they needed to do a clean up cut of the deck that they should NOT touch that area.  They didn't...

[Emo1956]

Years ago they use to dip the blocks in a hot vat  with acid mixture which they can't use anymore (as far as I know ). Burn blast is the block is put into a oven and heated up at 450 degrees and I was told they add some dye which shows cracks. Then it goes onto a basket where it is shot with steel balls. When the balls are new the block comes out shinny like the head in the pic.  I never had a block done when it had brand new shot in the machine.AS you can see from my blocks it beat the hell out of them I also just found out today that the machine had to much pressure in it. Just check with the person doing the job if there is some protection you can use to preserve the numbers.