1972 ZR-1 with 301 miles Link to Chassis Pictures

[Stephen B.]

Here's a link to the pictures of the 301 mile 1972 ZR-1 Corvette.

http://s122.photobucket.com/albums/o263/BunkyByrd/2010%20NCRS%20Regional%20Florida/

[Mike E.]

Re: 1972 ZR-1 with 301 miles Link to Chassis Pictures

Thanks!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[Erik S.]

Re: 1972 ZR-1 with 301 miles Link to Chassis Pictures

highly appreciated, on behalf of all chassis fans,

Erik

[Joe L.]

Re: 1972 ZR-1 with 301 miles Link to Chassis Pictures

Here's a link to the pictures of the 301 mile 1972 ZR-1 Corvette.

http://s122.photobucket.com/albums/o...nal%20Florida/

Bunky------

You mean to tell me that you were able to take all these photos of the chassis without some raving maniac NCRS "monitor" running you out? That's what happened to me at the NCRS San Jose convention when I tried to do the same for an original L-88.

Anyway, great photos. MUCH better than anything you can get out of the Vette Vues pictorial books.

Something interesting to note: notice the rubber strap component of the muffler hanger brackets. Note that there is a large portion of them that shows WHITE in color. This is because the sidewall of worn out tires was used by the manufacturer of these hanger brackets to fabricate th straps. So, if a whitewall tire was being used, then the strap would appear all or partially white. This was common with 68-72 hangers, both PRODUCTION and SERVICE. I don't know if it also affected other years.

[Stephen B.]

Re: 1972 ZR-1 with 301 miles Link to Chassis Pictures

All of you are quite welcomed. It took some time to work my way through the humanity of members under the car to take all of the pictures. I slowly worked my way from one end to the other in about 15 minutes. I probably have more pictures because I kept snapping them of the same areas at different angles when the crowd was not moving. lol. No one ran me out from under the car. lol. This one fellow kept sticking his finger in a frame hole, and we discussed how sometimes transport hook holes can be ripped.

I have a few pictures of a 1975 chassis with a couple of thousand miles on it. Believe it or not, the frame had even less rust than this '72.

[Edward J.]

Re: 1972 ZR-1 with 301 miles Link to Chassis Pictures

Joe, thats a great detail that I never knew about the hanger, I also noted that the rear hanger bolt -to frame was the opposite the AIM, I asked the question awhile back about the bolt direction, and I put as the AIM says, although it was as the 72 ZR1 was. I guess and can switch it around.I guess there maybe cars that are the other way.


Steve, thanks for posting the pic.s

[Terry M.]

Re: 1972 ZR-1 with 301 miles Link to Chassis Pictures

Joe, thats a great detail that I never knew about the hanger, I also noted that the rear hanger bolt -to frame was the opposite the AIM, I asked the question awhile back about the bolt direction, and I put as the AIM says, although it was as the 72 ZR1 was. I guess and can switch it around.I guess there maybe cars that are the other way.


Steve, thanks for posting the pic.s

Don't get too carried away with the exhaust system on that car. If you had been at the Advanced Judging School you would have heard the story of the car from the owner, and you would have heard my statement: "There are no Corvette virgins." You also would have heard my explanation of that statement.

If you were present you also would have heard my caution NOT to base your restoration on only one car -- unless you want the judges to tell you how your car should be different. You must do your own due diligence.

All you photo collectors have to evaluate what you are seeing on your own. That evaluation can not be accurately done unless you see the car in person, and have the opportunity to discourse with the others present. The pwner and I advised those present of what changes had been made.

[Joe L.]

Re: 1972 ZR-1 with 301 miles Link to Chassis Pictures

Don't get too carried away with the exhaust system on that car. If you had been at the Advanced Judging School you would have heard the story of the car from the owner, and you would have heard my statement: "There are no Corvette virgins." You also would have heard my explanation of that statement.

If you were present you also would have heard my caution NOT to base your restoration on only one car -- unless you want the judges to tell you how your car should be different. You must do your own due diligence.

All you photo collectors have to evaluate what you are seeing on your own. That evaluation can not be accurately done unless you see the car in person, and have the opportunity to discourse with the others present. The pwner and I advised those present of what changes had been made.

Terry-----


I don't know if the exhaust system is original to the car, or not. The "thickness" and degree of the rust seems more than I would expect for a 300 mile car, even considering the age of it. Nevertheless, the exhaust hanger straps made with "whitewall" tire sidewalls is something I've seen before on original 1968-72's. In fact, one of my originals had evidence of being from a whitewall tire. I have at least one very old SERVICE hanger with a whitewall strap. I've seen others, too.

I never could understand why that rubber strips cut from old tires were used for these hangers, though. One would think that the effort involved in cutting up the tire into appropriate and accurate-sized strips (ever tried to cut up a tire?) would cost more than just purchasing the stock in spools of the correct width and just cutting to length.

By the way, did anyone look at the crankshaft pulley on this car?

[Terry M.]

Re: 1972 ZR-1 with 301 miles Link to Chassis Pictures

Joe,
I am relatively confident those are the original parts of the exhaust system, however the finish is suspect. The first owner(s) painted the exhaust system to preserve it. As a result it has been off the car for clean-up and the muffler black-out is not original to the car. One can see the original paper part number tags on the exhaust tips, and the outline of the paper tags on the mufflers, indicating the re-finishing was done with care.

I too have noted the frequent use of the white wall portion of tires for the exhaust hangers. Even early C3s were "green." Or maybe it is just that "green" is not that new. Our ancestors reused many items we discard today, but they usually did it out of financial necessity.

[Joe L.]

Re: 1972 ZR-1 with 301 miles Link to Chassis Pictures

Joe,
I am relatively confident those are the original parts of the exhaust system, however the finish is suspect. The first owner(s) painted the exhaust system to preserve it. As a result it has been off the car for clean-up and the muffler black-out is not original to the car. One can see the original paper part number tags on the exhaust tips, and the outline of the paper tags on the mufflers, indicating the re-finishing was done with care.

I too have noted the frequent use of the white wall portion of tires for the exhaust hangers. Even early C3s were "green." Or maybe it is just that "green" is not that new. Our ancestors reused many items we discard today, but they usually did it out of financial necessity.

Terry-----


I did note the parts labels on the exhaust tips. However, they do not appear like typical SERVICE parts labels of the era. Also, these tips were usually supplied in SERVICE in a box. So, they would have required no labels. However, it's possible that the labels are GM Canada SERVICE parts labels. GM Canada did use some "odd-ball" SERVICE parts labels and sometimes supplied SERVICE parts "naked".

Did anyone observe or photograph the crankshaft pulley on this car? I'm still on a "one-man-crusade" to see if any 1970-72 ZR-1's used the cast iron crank pulley. I realize that all reported-on to date didn't have them, but I'm always curious when a another car shows up.

[Mike G.]

Re: 1972 ZR-1 with 301 miles Link to Chassis Pictures

i have several pics of that car. i will sort through them and see. i am glad this discussion came up because i notices problems with the exhaust, mainly the later model exhaust tips. they were not the 70 style.

[Edward J.]

Re: 1972 ZR-1 with 301 miles Link to Chassis Pictures

Joe, the pulley is cast iron or the harmonic balancer ? just a question as im was just wondering.

[Terry M.]

[Terry M.]

Re: 1972 ZR-1 with 301 miles Link to Chassis Pictures

Mike they shouldn't be 1970 style tips. The car is a 1972.

[Joe L.]

Re: 1972 ZR-1 with 301 miles Link to Chassis Pictures

Joe, the pulley is cast iron or the harmonic balancer ? just a question as im was just wondering.

Edward-----


I'm referring to the pulley, itself, and not the balancer. All balancers were cast iron. GM says that a cast iron pulley, GM #3929697, was used for the LT-1 engine installed in ZR-1 applications only. However, no original ZR-1's to date have been observed with this pulley.

It may be that while the 3929697 pulley was the pulley scheduled to be used for the ZR-1 application, St. Louis personnel never got that "message" and installed the same stamped steel pulley as used on other LT-1 applications, GM #3858533.

The 3929697 was also used for some MD/HD truck applications with small block V-8, but had no other applications. It's a very interesting, precision-machined and balanced pulley and it makes sense that it would have been selected for the ZR-1 application (even if it was not actually factory-installed for that application).