The aluminum coolant pump was covered by John Hooper in his 1969 Camaro Reference Book. There's a photo and it is definitely the long-style. It was noted in photos taken at Dick Harrells' shop early in 1969.
The casting number of the pump was 3968811. It was released to production and cancelled due to durability concerns. The owner of the #1 ZL1 Camaro during the restoration had connections to Chevy Engineering and was able to locate one. Original photos of the #3 ZL1 Camaro, built 9 weeks later, show a black cast iron pump.
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