Opinion on DZ Block Stamping
 

Hi, could I get some opinions on this block stamping, I know my thoughts but would like some more input. Thanks.

I'll let others comment on the stamping, but the broach marks don't look good. I've never seen them quite that heavy before.

The stamping does not match up with other known genuine September examples.

Looks like the block was decked with a belt sander.

Don't like the stamping or broach marks...

Looks a little "fresh" George.

Those are non-OEM broach marks.

Dan

George
That looks like it was done by a Greg Long protege.
Is it from Angola,Indiana by chance?

Looks like it was punched yesterday.
-No sir I don't like it at all-

I'll add my vote to not liking the surface or the stamp, both of which appear to have been done in the recent past.

So not trying to piss anyone off but at time when you have to deck your block for whatever reason. You've owned the car forever and try to reproduce the real numbers and tell people that you did reproduce your original numbers, and documented it is it okay? I'm only asking because I know somebody that went thru this and didn't try to scam anyone. He still owns the car for 40 years and explains this to anyone that wants to listen.

It's ok but still devalues it. A machinist can deck a block without cutting that area. They usually don't think it matters.

George, I’d say those broach marks are way too heavy, and so is the stamp.

WRT the guy that re-stamped his original block, I think he’s digging a deeper hole. I’d rather have to explain why my block was decked, than to have to explain why the block was also re-stamped. Perhaps the right person may have been able to lift an impression of the original stamp but now even that’s lost.

Congrats on your 1970th reply Helmut. :burnout:

My brother had a block decked and the machinist left the stamped area untouched.

Decking while leaving the numbers can be done. I only post this picture because it is a car I owned twice. The car has no deduction during judging, even at a National level.
An ex CanAm racer owned this car before me and felt it was necessary to deck the block.

On a proper rebuild, if you're particular about the details, it's almost always necessary to deck a block if you want things square.

I haven't come across a virgin block yet that is square, some even twisted. Even a brand new GM crate engine I have here isn't square and it hasn't even been run yet. Sometimes I come across blocks that were decked and still not square. It's also beneficial to have the piston as close to zero deck as possible for better quench, although on Chevrolets when stamps become an issue I usually spend the money on custom pistons and move the pin height.

But I'm one that is very picky on my engine builds and always looking to make them better than factory, even on a stock build. I just finished a 455 for a customer that came from what was supposed to be a reputable shop. It was decked. Was found to still be uneven front to back, had to take another .007" off.

Just tossing out some reasons why people deck these old engine blocks. 40 years ago no one cared about the numbers. The saving grace on some of these where the damage is already done is that you might be lucky enough to have an untouched vin stamp by the oil filter.

Yep, I just cut my IROC Camaro's block without removing the numbers.

https://www.yenko.net/forum/attachme...1&d=1568126846

There ya go :biggthumpup:

I've seen more of this now that the hobby has become a numbers game.

block stamping
 

Thanks for all the comments, I appreciate it. Rick, I am not sure who did the engine. The car originally came from New York, but the restoration was not done there, from what I know the motor was built in North Carolina, not sure of the builders name. Thanks again, George

This hobby has been a #'s game for collectible cars for 40 plus years. Not all are interested, but purist have always been interested in #'s.

Automotive journalist extraordinaire, the late Brock Yates once asked a prominent collector about the state of the hobby:

"Speaking of fakes, major danger areas include Corvettes, Porsches, Cobras and muscle cars of the '60s and '70s. Too many parts and pieces. You can build masterly fakes, including matching serial numbers. Unless you have absolute, iron-clad, bullet-proof histories and really know your stuff, avoid 'em like the plague."

Yates wrote that June, 1996. 23 years later, not much has changed.

Now the cowl tag for the same car, thoughts ?
 

Here is a picture of the cowl tag from the same car. It looks ok to me but I am far from a expert. Opinions on it. Thanks.

Real deal. In the CRG db for many years.

Nice! Daytona Yellow with Black vinyl roof and Yellow Houndstooth Interior.

I don't agree completely. While there is some truth to that and there were guys that cared, it was few and far between that long ago. 40 years ago a lot of these cars weren't much more than just 10 year old gas guzzler used cars that were just cheap hot rods at that time that people practically gave away.

These days it's definitely a different ball game when buying and selling, and the prices these cars bring now have driven people to be more frugal with what they are getting for their money.

Interesting, the car used to have the original V0722DZ block in it.

DZ Block
 

Hi Kurt, I will send you the pictures of the number stamped on the side of the block, William also has pictures. Thanks.