Rocker Arm help

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I’m going to show you guys some pictures of a new set of Edelbrock heads. They have the exact parting line that I’ve seen on speedmaster heads. Hmmmm

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Is it a visual artifact from machining or do the saddles have a "W" shape to them like the SM heads? Any chance on a picture from the side of the saddle with a shaft in the head?
 
Two year update. After the initial loosening (half torque in under 200mi) they've remained tight since I retorqued in spring 2022.

Not an ideal situation, but it seems sorted out on my end
 
Two year update. After the initial loosening (half torque in under 200mi) they've remained tight since I retorqued in spring 2022.

Not an ideal situation, but it seems sorted out on my end
I check mine every winter and have never found a loose one, although mine have never been loose and I verified my saddles didn't have a high spot in the middle. Car runs low 7.20's in the 1/8th with 273 adjustable rockers on pump gas.
 
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