Pad Stamping

[Gene M.]

Re: Pad Stamping

I have a 1970 ZR1 one owner prior to me, my pad was rejected and was identified as a "re stamp". It is absolutely the original block, i argued and the judge reversed that call but deducted for broach marks. The marks are visible with the head off but shot blast obscured the broach lines, So what is the best move? Counterfeit the deck marks to look original or pull the head at judging? I personally think undoing original is not the way. RDR

You understand the shot blasting changes the appearance don’t you? The evulation is as the car is presented if it don’t look typical as presented then EXPECT DEDUCTIONS. The pad is evualated as presented less any explainations it is only as it appears as presented that the judge should consider.

Just eat the points and move on. If you wanted a better evulation next time get a car with an ALL ORIGINAL UNALTERED PAD.

[James G.]

Re: Pad Stamping

Speaking of 1970 ZR1's there was a M22 at Charlotte this fall with a 1970 Corvette VIN on it... it didn't dawn on me until half way home that it had to have been out of a ZR1.

[Gene M.]

Re: Pad Stamping

Speaking of 1970 ZR1's there was a M22 at Charlotte this fall with a 1970 Corvette VIN on it... it didn't dawn on me until half way home that it had to have been out of a ZR1.

Either the car is destroyed or is running around with a 5 speed Tremec.............

[Mike M.]

Re: Pad Stamping

bet move is to take the 38 point deduct. you are not alone on this issue. mike

[Dan A.]

Re: Pad Stamping

While we are hijacking this thread I will respond to Ronald Rains post #14.

Seems to me the described problem with the pad surface and stamps I'm sorry to say is on you . By your own admission you allowed them to be shot blasted which altered them. So altering them further as you suggest and I quote "So what is the best move? Counterfeit the deck marks to look original or pull the head at judging?" is likely to obscure further the appearance of the pad surface and stamps.Then you appear in part to see the light. I quote "I personally think undoing original is not the way.". I'm thinkin' you've already done that although not consciously by allowing the pad to be exposed to shot blasting. Suggesting to alter things further in an effort to fool others only digs a deeper hole. I won't comment on the unreasonable proposal to pull a head during judging. Which by the way is not permitted. Please forgive me but I fail to see your point.


Officer Don gives the absolute best advice. You know what it is and aren't trying to fool anyone. Man up and take your lumps for the alteration error and Let it be.


Now two questions.


1.Did the judge use the words restamp or not typical?


2. Was your post in answer to the one above yours regarding big block vs. small block broach marks?

[Dick W.]

Re: Pad Stamping

I have a 1970 ZR1 one owner prior to me, my pad was rejected and was identified as a "re stamp". It is absolutely the original block, i argued and the judge reversed that call but deducted for broach marks. The marks are visible with the head off but shot blast obscured the broach lines, So what is the best move? Counterfeit the deck marks to look original or pull the head at judging? I personally think undoing original is not the way. RDR

Don't touch it and take the points hit. If you attempt to correct it there is a good change that things could go downhill in a hurry

[Terry M.]

Re: Pad Stamping

I would appreciate those who know correcting me if I am wrong here...

Broaching...
broaches wear and the tooling wears/degrades thus the broach scrapes exhibited should show a progression of degradation determined by the time at which the particular block was broached within the tooling's life cycle.
Other blocks in the same time frame should have broaching which looks QUITE similar.

Flint's SB broach I imagine was put into service with the 265 V8...
Tonawanda's BB broach was put into service maybe with the mystery motor?? in 1962? OR was it closer to the Mark IV introduction in 65?

Is this why the BB's have more distinct broaching marks?

James
Please be aware that Flint had three broach machines and Tonawanda two (at least in the mid 1980s, and I doubt, given the size of those machines, that it ever was any different). To try to figure how the broach marks should look based on other cylinder cases assembled around the same time is a fools errand.

To answer the original question by Walter: There is no one who can machine the surface and stamp a cylinder case without it being detected by some people. Can you get it by some of the people, some of the time? Yes. If that is what you are willing to settle for, my guess is you have already received some PMs suggesting folks who do that process. Most/all of us here are unwilling to publicly name practitioners.

[Walter R.]

Re: Pad Stamping

Not trying to get anything by anyone. Just want to have block stamped with correct ID numbers. Block has never been stamped.

[Edward J.]

Re: Pad Stamping

Walter, engines unlimited will do. just google that .

[James G.]

Re: Pad Stamping

Thank you for the information...

Tonawanda had TWO - one Small block and one Big block?

Meaning all BB's were across the same broach?

[Dick W.]

Re: Pad Stamping

Not trying to get anything by anyone. Just want to have block stamped with correct ID numbers. Block has never been stamped.

With an unstamped block you are golden

[Terry M.]

Re: Pad Stamping

Thank you for the information...

Tonawanda had TWO - one Small block and one Big block?

Meaning all BB's were across the same broach?

Sorry, I should have qualified that statement. I was touring only the big block production area. I did not get to see other production lines.
Thanks for raising the question.

[Phillip M.]

Re: Pad Stamping

Sorry, I should have qualified that statement. I was touring only the big block production area. I did not get to see other production lines.
Thanks for raising the question.

So, are we saying that the cutters on these multi million dollar machines were not replaceable? Seems to me that if the cutters are replaced when damaged/worn, that could conceivably change the appearance of the tooling marks on the pad, no matter how many broach machines the plant was running.

[Patrick B.]

Re: Pad Stamping

The idea that NCRS judging is so precise that it is concerned with differences between broaching machines and cutters at a plant is truly silly. The original surfaces on big blocks are pretty smooth and some early 327's can look a little rough is about all that can be said about factory deck surfaces in my humble opinion.

[James G.]

Re: Pad Stamping

The sets of progressively deeper "knives" are shown here.