3969811 water pump ZL:1 or copo 425 HP 427 ??????
i have a water pump with a casting number 3969811 with a date code D 29 9, were these used on the 69 ZL1 engines as well as the L-72 427 engines, my book shows use in the 70 LS6 and LS5 engines but this is to early of a date, anyone have info on this one. thanks.
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