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Hello Doug, So the '29 oil pump was a hold over from the '28 4 cylinder engine. Now it has to supply oil to two more cylinders and a higher speed engine. Some of those pumps only had 1 vane instead of 2. If you have the engine apart that far you might think about upgrading to a '30 to '32 oil pump. The way to tell is that the casting for the impeller is about 1/8" deeper than the 1/2" one on the '29 pump. The other thing to do is upgrade the 5/16" copper line from the oil pump to the engine block to 3/8" copper compression tubing, and 1/4" pipe fittings instead of the 1/8" pipe fittings. Some of us have also drilled out the oil passage to the oil distributor valve to increase volume.
A '30 to '32 oil pump can often be sourced for $35, or so.
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