Voulez-vous une section spéciale pour les ZR1 ?

Leshark81 a écrit:La 1ére ZR-1 était une C3

From 1970 to 1972 there was a special ZR1 high performance package Corvette available. This Corvette came equipped with a modified LT1 engine producing 370 hp, the M22 transmission, a transistor ignition, a customized aluminum radiator and beefier brakes, springs, shocks and sway bars. This package was available to the buyer for a little over $1000 and in true performance car style could not be ordered with power steering, power windows, air conditioning, a radio, wheel covers or a rear window defogger system. As C3 expert and www.corvetteforum.com member 66L36Coupe puts it "the C3 ZR1 in essence can be described as an L88 prepped chassis with a slightly modified LT1 Engine stuffed in it." Today these cars are extremely rare and can be seen with price tags from $150,000 and up. Many people have been able to build clones of these cars today but the experts are always able to tell which is a true ZR1 and which is a copy.

First, the "package" consisted the LT1 engine (see below for how it differed from standard LT1 powerplant), M22 HD close ratio transmission, F41 Special Purpose Suspension, J56 HD Brake Package, HD Aluminum radiator, and HD posi rear end. The only "options" available when ordering the special purpose engine package were deluxe interior and tilt/tele column. PW, PS, AC (like all LT1's), radios, rear window defrosters and PO2 wheel covers were precluded from availability. The C3 ZR1's can in essence be described as an L88-prepped chassis with an slightly modified LT1 stuffed in it.

The LT1/ZR1 Engine WAS a different assembly than the standard LT1 - Hence the different suffix codes assigned to call-out the non-standard parts required. Although the internals, intake and exhaust were identical to standard version LT1, the CTV suffix code in '70 (and the CGY in '71 and CKZ in '72) were fitted with a 10.5" light weight L88-style flywheel and corresponding 403 bell housing as well as a High-torque L88 ('69 coded & dated) starter with aluminum nose. Some say the ZR1's used a cast-iron balancer pulley, but I've only been able to report stamped units.

As for the questions regarding fan shrouds, the '70 & '71 ZR1's all appear to be fitted with the base-engine type metal fan shroud. The '72 cars were not. There is one other item often overlooked when reviewing the HD radiator/cooling system on ZR1's; it's that the HD radiator used a modified (widened) radiator core support. They appear to be left-over pieces that were modified originally for the '68 and '69 run of L88's. My ZR1, as well as Sal Carbone's '70 ZR1, have a grease pencil marking written on the core support stating, "L88 ONLY" (my car) or "L88" (Sal's car) so the line workers could tell them apart from the base-engine supports when installing the 3007436 Aluminum HD radiator. I suspect other "real" ZR1's will have this marking as well.

There are many other details that can help verify the status of C3 ZR1's that aren't public knowledge, and in some ways, they're better kept under wraps as not to encourage a spate of counterfeiting like we've experienced with other high-performance optioned Corvettes. After all, you can buy most of the parts required to "build" your very own ZR1. The devil is always in the details - and the documentation

PMOPMO a écrit:et la section Z06 alors ???

Alec a écrit:

PMOPMO a écrit:et la section Z06 alors ???

Alors là j'en était sur ! Combien vous êtes ? Mais tu pourrais très bien initier cette rubrique surtout que tu vas avoir un moteur neuf

Leshark81 a écrit:La 1ére ZR-1 était une C3