smog pump # on 400 hp 427

[Tom H.]

Can anyone tell me what the correct part number should be for the smog pump on my 69 400 hp 427 3x2 engine. Thanks, Tom

[Joe L.]

Re: smog pump # on 400 hp 427

Tom-----

Yes, I can tell you. The correct part number for the air injection reactor pump originally used on your car was GM #7803948. This was the exact same pump used for all other 1969 Corvette engine applications EXCEPT L-88/ZL-1. The problem is, this number appears absolutely nowhere on the pump. So, you can't use a number to ID a pump you might find (unless you find an NOS, in-the-box, new pump with this number on the box). There are casting numbers to be found on the backing plate and the aluminum pump housing. The backing plate number will not identify the pump since the same plate was used on many other pumps. The pump aluminum housing casting number can be useful in identifying the pump, but this number cannot be seen while the centrifugal filter ("fan") is installed on the pump.

[Tom H.]

Re: smog pump # on 400 hp 427

Joe, Can you tell me what part # 7801149 (I don't know if it is a casting # or part #) would be? It is supposed to be a 69 pump #.

[Joe L.]

Re: smog pump # on 400 hp 427

Tom-----

That's the casting number for the rear plate. It was used for 1969 pumps. However, it was also used for 1968 pumps, 70-71 pumps (which are the same as 69) and, I believe, other pumps. So, that number, alone, does not positively ID a pump.