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454cid

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The only thing I can come up with is if the bottom of the distributor being missing leaves too large a gap in an otherwise pressurized passage, maybe?
 

evilunclegrimace

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That is correct, The bottom of the distributor has a groove in it to direct oil from the filter passage up to the cam and lifter oil galleries
 

evilunclegrimace

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The distributor mount hole through the block is at an angle, and the pad where it locks down is cast and machined at a slight angle, after all, the cam shaft center line is DEAD CENTER,in the block and the distributor gear is riding ,with its gear teeth meshed to the side of it. The dist fits fairly tight to the block, since it completes the oil passage in the block to the pass side lifters,but that means the distributor leans just a bit from true vertical , so if you do notice that, its normal, and correct.
 
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