yes most shaft rockers are alum, jessel, td, crower, yella no terra, tomahawks, all are strong as hell and are designed for max effort springs, i still like the crower ss shaft rockers but unless you are running monster springs and huge roller cams you don't need em, FWIW if you want a shaft rocker that fits under a stock valve cover the tomahawks may be the deal as they are the only off the shelf D-port shaft rocker i know of and at 795 a set they are priced well compared to a top of the line stud mount setup.
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