Pushrod Types

One of the things that I noticed when I took the 400 apart was that there were two different types of pushrods used on the engine. It took a little digging to find out the reason. One pushrod had a standard shaft with a round end and the other type looked as if a ball bearing was stuck on the end of a rod.

pushrods

Top pushrod has a "ball bearing" end and the bottom has a spherical end

The ball bearing style allows a greater rocker arm ratio and more angle. The standard 1.5 to 1 rocker arm would work fine with the standard spherical end while a 1.6 to 1 rocker ratio may require the ball bearing style of pushrod.

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Copyright May 2011 Eugene Blanchard