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By 55blacktie - Last Week
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There are two photos of connecting rods that are posted on Facebook that show an oil hole in the big end, near the beam. The poster said that they are for his 312. They're not aftermarket, so I assume that they are ECZ rods. The poster expressed concerns over his Mummert aftermarket rods not having the oil hole in the big end. I have looked at photos of OEM and aftermarket rods, but I didn't see an oil hole in the big end. Could it be that someone drilled the holes in his rods during a rebuild? Did any Ford Y-block rods leave the factory with the oil hole? What is its purpose? The poster seems to think that the hole is there to provide additional oiling to the cam. Is the hole necessary or desirable? I could see where the hole could weaken the rods or even be a cause of cracking around the hole.
The only oil hole I'm aware of is at the top of the rod for the wrist pin. The bearings receive lubrication from the oil passages in the crankshaft journals. If John Mummert thought the oil hole in the big end were necessary/desirable, he's certainly capable of drilling the holes before passing his rods onto customers. I've asked Ted Eaton, but he hasn't replied yet. I would like to address this on Facebook, post a definitive answer, and put it to rest.
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By 55blacktie - 3 days ago
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Got my answer. Yes, all stock Y-block rods have the hole. Aftermarket rods don't need it.
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