SilverDevil;
Sunday 5/31 was Metro Long Island Chapter Meet at Mack Pontiac/GMC. 18 cars were judged, 8 of them being C3's.
Here are pictures of the judged C3's:
...
I know what this plate meant. Yes, that's a ZR-2!

CSS996 wrote:
I've read several Corvette books, and never heard a mention of a ZR-2.

The ZR1 option available exclusively with the LT1 is significant for engineering, though not many saw production. It was a special racing package that included the solid-lifter small-block engine, heavy-duty four-speed transmission, power brakes, aluminum radiator, and a revised suspension with special springs, shocks, stabilizer bar, and spindle-strut shafts. Since it was competition equipment, the ZR1 could not be ordered with power windows, power steering, air conditioning, a rear-window defogger, wheel covers, or a radio. But the ZR1 package was quite expensive, and few Corvettes were so equipped.

A similar ZR2 package was listed for the big LS6 engine and was just as rare. Per GM policy, 1971 Corvette engines were detuned to run on low-lead fuel -- save the LS6 454, which belatedly bowed with 425 bhp on premium gas. Installations totaled just 188, including a mere 12 cars with a $1,747 ZR2 package, basically the ZR1 with the big-block V-8. This would be the only year for both the LS6 engine and the associated ZR2 equipment.

ghoffman wrote:
That is what they should of offered in leiu of the LT-5. An aluminum Rat weighs less and the power is essentially unlimited. I like my 427!!

ghoffman wrote:
The big block made more power than the Lotus, and the new LS series all smoke the LT-5. Seems like they know very well how to make a motor. At a dyno day a couple of years ago, a stone stock LS7 made about 120 RWHP more than a chipped LT-5. Even back then, the LS6 454 crate motor made about 90 more HP than the LT5 and did not weigh any more. I just think Dave McClellan had a 4 cam and bad hair fetish.