In comparison, a big block has a pivot length of 1.65-inches). This means the arc it travels in is comparatively small, particularly in contrast to other pushrod engines (Jesel notes that a stock small block Chevy has a rocker pivot length of 1.40-inches. For example, in something like a small block Chevy application, the stock rocker has a relatively short pivot length. The reasons for moving toward a shaft-mount rocker are many-fold. Where, at one time, it was sufficient to replace something like a stamped rocker with a rollerized example, now we’re dealing with shaft rocker setups complete with a wide range of upgrades and options. When examining today’s crop of roller rockers, it becomes clear that a considerable amount of research and development has occurred over the years - particularly when it comes to race applications. Tons of options are available when it comes to rocker arms for domestic V8 engines.
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