64 Z-06

[George J.]

Re: 64 Z-06

Duke,
Thanks. In the SCCA I seem to remember that the divisions within the production classes moved fairly often. A chart would be very helpful. The FIA system was more clear what with the "up to 1500cc, and under 1500cc" type of classifications.
Regarding the SCCA system, a line from the movie "Miller's Crossing" comes to mind - "Clear as mud".

[Michael H.]

Re: 64 Z-06

Duke,
Thanks. In the SCCA I seem to remember that the divisions within the production classes moved fairly often. "

I don't remember how the class breaks went but in the early 60's, a 57 with a 283 would be a B/Prod but a new 63 with a 327 would be an A/Prod.
By 1966, I think a new 427 Car would be A/Prod and the 63 with a 327 would move down to B/Prod??

[Duke W.]

Re: 64 Z-06

When the big block came out in 1965, 327s were moved to BP and 283s were moved to CP.

When the 350 was introduced in 1969 they were classified BP. At that point I'm not sure if you could "upgrade" a 327 to a 350 or maybe the 350 Sharks had a slightly higher minimum weight.

Corvettes pretty much stayed classified as above until AP, BP, and AS were combined into the GT1 class. And at the same time the GT2 was established and included BS and (I think) CP and maybe DP. E through H production remained.

BTW 283 C1s were no longer competitive going back to the early seventies when the 240Z showed up.

There is pressure on SCCA to keep classes "contemporary". In other words, Mazda is not going to provide any racer support if Miatas get blown off by 40 year old MGBs, so at some point SCCA typically juggles the rules to make really old cars non-competitive except in the small bore production classes, which are still around and still dominated by vintage cars.

It's too bad that you can't go out and buy a late model Corvette, prep it and go racing like you could back in the sixties. Those days are long gone.

However, the ALMS GT2 class (this year) and GT (next year) is somewhat akin to Trans-Am cars back in the late sixties - basically production cars modified for racing. It takes a professional level effort - works support or big time sponsors to be competitive, but the cars that will be running next year in GT are basically modifed production cars rather than "silhouette cars" like the old GT1.

Duke

[Rex T.]

Re: 64 Z-06

While reviewing some of my posts, I ran across this one and was wondering if anyone else has any additional input regarding other 64 J-56 cars.................was hoping to have mine at Bloomington this year, but may not make it.

Thnx,
Rex

[Matt L.]

Re: 64 Z-06

While reviewing some of my posts, I ran across this one and was wondering if anyone else has any additional input regarding other 64 J-56 cars.................was hoping to have mine at Bloomington this year, but may not make it.

Thnx,
Rex

I have a 1964 FI w/Ti came off the line in 01-06-1964. Appears to be the first Ti car produced. Also has the J50 power brakes, F40 suspension, K66 transistorized ignition, L84 Fuel injection, M20 trans, G81 posi 4:11, A01 soft ray tint on all windows, A31 power windows and N11 off road exhaust. Still has the original brake pads, but exhaust was removed and side pipes put on.

[Doug L.]

Re: 64 Z-06

What I have to add isn't going to answer any questions, but for information sake, I have the original "Retail Order Form" and the original dealer invoice for my '64. Body assembly date of 13 December 1963. The buyer ordered "metalic brakes" and those words appear on both documents. There is no mention of any codes on either document for any of the ordered options. I have not reviewed the Adams book to see if metalic brake shoes were available without the finned drums or vented back plates, so my metalic brakes may have nothing to do with the subject matter of this thread. My car also doesn't fit the period mentioned in this thread. Were metalic shoes available without getting the "Z06" option.
Doug

[Dan H.]

Re: 64 Z-06

Doug, the metallic brakes are the sintered metallic ones with non finned but specially finished drums, also they included a power booster, option J65. Same as my Mar 64.
Dan

[Duke W.]

Re: 64 Z-06

J-65 Metallic Brakes were commonly ordered with SHP/FI engines. They are impossible to distinguish during Flight judging, but the front drum casting number, which is visible when you remove a wheel is different than base brakes because they have a thicker web. The linings are "sintered" (segmented) and magnetic, so they are easy to distinguish from conventional linings.

If shoes and drums were changed durilng the life of the car then it is usually mpossible to determine if J-65 was part of the original build, however, J-65 used special heat treated springs which had different color codes than base brakes, so this evidence may remain.

J-65 did not include a vacuum power booster, but could be so equipped if J-50 was ordered along with J-65. If you search "J-65 brakes" in the archives you should find considerably more information.

The J-56 brake option was called Heavy Duty Brakes. A dual master cylinder and vacuum booster was included with this option.

Duke

[Mike M.]

Re: 64 Z-06

duke: never seen a 64 with dual master cylinder. regards,mike

[Duke W.]

Re: 64 Z-06

A dual master cylinder was included with the J-56 HD brake option, which was the same brake system that was included in the '63 Z-06 option, but there were only 29 J-56 options built in '64, so it's a very rare option.

The J-65 option numbered 5310/4780 for '63/'64, respectively, and the price was $37.70/53.80, so they were a heck of a deal.

Duke

[Matt L.]

Re: 64 Z-06

Would it be advisable to upgrade to a dual master cylinder for safety concerns? I was told to use the master cylinder for a 1969 corvette.
I'll send pictures of my brakes. I think they are the original pads and hardware.
Thanks, Matt

[Duke W.]

Re: 64 Z-06

No. The reason hydraulic components fail is lack of maintenance - periodic fluid changes to remove contaminents including water that corrode the system internally and eventually result in leaks and failure to hold pressure.

If your fluid is not crystal clear, it needs to be changed and the hydraulic components may be suspect.

They are easy to rebuild, and doing so now and adding an appropriate change interval based on your climate should ensure that they last indefinitely.

If you wish to discuss your brake situation further, please start a new thread as the current discussion is WAAAAY off topic from the original topic of this three year old thread, and it does not appear that your car has J-56 brakes.

Duke

[Matt L.]

Re: 64 Z-06

Yes it is. I will post a new thread with pics of my brakes.
thanks for the tips.
Matt

[Dan H.]

Re: 64 Z-06

J-65 Metallic Brakes were commonly ordered with SHP/FI engines. They are impossible to distinguish during Flight judging, but the front drum casting number, which is visible when you remove a wheel is different than base brakes because they have a thicker web. The linings are "sintered" (segmented) and magnetic, so they are easy to distinguish from conventional linings.

If shoes and drums were changed durilng the life of the car then it is usually mpossible to determine if J-65 was part of the original build, however, J-65 used special heat treated springs which had different color codes than base brakes, so this evidence may remain.

J-65 did not include a vacuum power booster, but could be so equipped if J-50 was ordered along with J-65. If you search "J-65 brakes" in the archives you should find considerably more information.

The J-56 brake option was called Heavy Duty Brakes. A dual master cylinder and vacuum booster was included with this option.

Duke

Duke, 64 J65 included the booster in it's price, a good deal. The drums have the same casting number as standard drums but the front drums have a thicker center web used, about .135 vrs .110. The front drums of a J65 car have an 'X' stamped into it to identify it, the rear drums have an 'L' stamped in them. Part numbers were different for the J65 drums, casting number the same. Regards,
Dan

[Matt L.]

Re: 64 Z-06

I have a 1964 FI w/Ti came off the line in 01-06-1964. Appears to be the first Ti car produced. Also has the J50 power brakes, F40 suspension, K66 transistorized ignition, L84 Fuel injection, M20 trans, G81 posi 4:11, A01 soft ray tint on all windows, A31 power windows and N11 off road exhaust. Still has the original brake pads, but exhaust was removed and side pipes put on.

Here's a picture of the J50 brake package, at least I am told it's J50. Any thoughts if that is true or a different package??
20120909_171652.jpg20120907_184000.jpg20120909_171612.jpg