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techtalk:ref:engmech01v [2025/08/07 02:23] – [Solids vs Hydraulics and Pushrod Types] hippysmacktechtalk:ref:engmech01v [2025/08/07 02:52] (current) – [Solids vs Hydraulics and Pushrod Types] hippysmack
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 === When are applications where you can't use a stock lifter? === === When are applications where you can't use a stock lifter? ===
 When you run out of tappet anti-rotation pin clearance. Red Shift 585's have stock base circles and typically require an aftermarket tappet that has longer anti-rotation flats. SE 575's have almost as much lift, but they have a smaller than stock base circle, so they typically don't cause tappet pin clearance issues. ((https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/27298-adjustable-vs-solid-pushrod))  When you run out of tappet anti-rotation pin clearance. Red Shift 585's have stock base circles and typically require an aftermarket tappet that has longer anti-rotation flats. SE 575's have almost as much lift, but they have a smaller than stock base circle, so they typically don't cause tappet pin clearance issues. ((https://www.xlforum.net/forum/sportster-motorcycle-forum/sportster-motorcycle-motor-engine/sportster-motorcycle-motor-top-end/27298-adjustable-vs-solid-pushrod)) 
 +
 +=== What is the advantage of using non-adjustable pshrods? ===
 +A non-adjustable pushrod is stronger at a given weight and also less likely to cause "rub" issues, which can be a source of noise. Also, you reduce the potential for leaks by using the stock pushrod tubes instead of collapsibles. 
  
 === When do you stop using fixed pushrods and switch to adjustables? === === When do you stop using fixed pushrods and switch to adjustables? ===