Originally Posted by William (Post 1657557)

The first two ZL-1 Camaros were rushed into production and delivered to Fred Gibb Chevrolet December 31, 1968. The #1 car was prepared for drag racing and failed tech inspection at its first event in AZ. It had been built with the production L-72/L-78 #3959164 #4346 780 CFM vacuum-secondary carb. At that time, it was thought to be a supply problem. However, the 850DP carb had been in production by that time; 1968 dated carbs are known.

A likely reason for the substitution was the production ducted hood air cleaner was not designed for use with a double-pumper carb. The air cleaner had a 90° vent tube on the rh side that interfered with the secondary accelerator pump. It appears likely that Chevrolet Engineering knew this; box #176 on the Chassis Broadcast Copy for #1 & #2 shows carburetor code ‘GE’, the production code for the 780. [Carbs were installed at the Norwood assembly plant].

In interviews with Fred Gibb, he stated the 50 cars he received were built with the 780. In magazine drag tests [Super Stock May ’69; PHR July ’69] of the #1 & #2 ZL-1 Camaros, the ‘street’ ZL-1 was tested with both carbs. Gibb stated Chevrolet retrofitted the remaining cars in stock at the dealership early in 1969. It is not known what modifications were made to accommodate the 850DP.

As for the other 19 ZL-1 Camaros, #3 and #51 were built during the same time span as the Gibb cars. #3 was photographed for a road test feature in the August 1969 Hi-Performance Cars magazine. The engine photo shows a 780 carb, choke plate intact. One of the last ZL-1s [built May ‘69] was raced for many years, sold to its second owner in the late ‘80s. The original owner stated at the time that he swapped the 780 for an 850DP purchased at a speed shop, had the receipt to verify.

37 of the 50 Gibb ZL-1 Camaros were returned to Chevrolet and re-invoiced to other dealerships. By that time, they had been retrofitted so it is likely their original owners assumed the carb was original.

Considering what is known, there is little reason to believe any ZL-1 Camaro was built with the 850DP.

The vintage story/photographs seen here were the work of Ro McGonegal, free-lance auto journalist in the '60s. While it is widely believed the 'street' ZL-1 in the feature was the #5 car, Ro recalled the testing took place on an unusually warm day in January, 1969 at KCIR near Harrell's shop. The only two ZL-1s in existence at that time were #1 & #2.

Originally Posted by William (Post 1662287)

It is possible Stauffer was the original selling dealer. Or not.

When the 37 Gibb cars returned to Norwood, Central Office executives started shopping them to Hi-Performance dealerships. Some dealerships took them early in the process and were noted on the famous Super Chevy list. In going through the Gibb paperwork, I noted letters from Gibb to Central Office as late as November 1969 asking for ZL-1 floorplan charges to be removed. Nothing like this had ever been done, there was no process to account for them. As late as June 1969, even Chevrolet didn't know where some of them were. [I suggest reading "On a Clear Day You Can See General Motors" by J. Patrick Wright to gain an understanding of what a mess Chevrolet was in 1969 when John DeLorean became General Manager]. Complicating matters, Gibb wholesaled six of his 50 to other dealers. Some of the other 19 were also wholesaled [54, 56, 59, 62, 68] to other dealers. Dealer trades were not directly reported to Chevrolet; they would learn of it when the "sale card" was returned to Central Office.

A good example is Degnan Chevrolet in Philly. They ran ads for a 4-speed ZL-1; no idea which one. Could even be #12...