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The 351C engine, introduced in 1970, was fitteed with the D0AZ-8501-E water pump with a left-hand inlet, just like Boss 302, 302, and 351W engines from 1970 and up. The only real difference in these water pumps is flow rate. They are virtually interchangeable otherwise.
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Don't you believe it!
I'm fitting an electric water pump and need a cover where the water pump was. I had a water pump from a '68 302 cut down and blanked off, the guy did an excellant job it was a work of art (thanks Brian) but when I tried to bolt it to the block I found out that the bolt patterns were different. The bolt pattern for the '68 matched the ford small block family from 221 to 351W but the 351C is different.
I'm now having a 351C waterpump modified to act as a cover. If anyone's thinking of adding an electric water pump to their 221 to 351W I know where there's a waterpump cover!! /ubbthreads/images/graemlins/smirk.gif