Author Topic: opinion about this block  (Read 2772 times)

Emo1956

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opinion about this block
« on: March 07, 2019, 01:59:18 PM »
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

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Re: opinion about this block
« Reply #1 on: March 07, 2019, 02:31:51 PM »
They might want to see a picture of the entire pad as well as this picture....Joe
See America's First, Chevrolet

1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968 pnt OO. Purchased March 1976
1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969 pnt 76E. Purchased April 1981

69Z28-RS

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Re: opinion about this block
« Reply #2 on: March 07, 2019, 03:31:20 PM »
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??
09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette, '60 Corvette, '72 Corvette
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

william

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Re: opinion about this block
« Reply #3 on: March 07, 2019, 04:02:28 PM »
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.
Learning more and more about less and less...

Emo1956

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Re: opinion about this block
« Reply #4 on: March 07, 2019, 04:06:16 PM »
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

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Re: opinion about this block
« Reply #5 on: March 07, 2019, 04:09:58 PM »
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

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Re: opinion about this block
« Reply #6 on: March 07, 2019, 04:11:44 PM »
Whoops, it said someone was leaving a message at the same time. oh well.. Danny

Emo1956

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Re: opinion about this block
« Reply #7 on: March 07, 2019, 04:11:50 PM »
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

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Re: opinion about this block
« Reply #8 on: March 07, 2019, 04:19:42 PM »
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

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Re: opinion about this block
« Reply #9 on: March 07, 2019, 09:50:24 PM »
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?
Doug  '67 RS/SS 396 auto I know the car since new

69Z28-RS

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Re: opinion about this block
« Reply #10 on: March 08, 2019, 03:04:20 AM »
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... :)
09C 69Z28-RS, 72 B 720 cowl console rosewood tint
69 Corvette, '60 Corvette, '72 Corvette
90 ZR1 red/red #246, 90 ZR1 white/gray #2466
72 El Camino, '55-'56-'57 Nomads, '55-'57 B/A Sedan

Emo1956

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Re: opinion about this block
« Reply #11 on: March 08, 2019, 03:55:16 AM »
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.

 

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