Smaller than stock base circles are common in high lift cams as a way to alleviate Using camshafts with a different base circle can create the need for different length pushrods to compensate.Changing to aftermarket rocker arms with different geometry can change the needed pushrod length in either direction.The valves in the heads to gain valve-to-valve and/or valve-to-piston clearance, and using longer than stock valves to correct geometry or gain travel with very high lift cams. Common reasons for valve stem protrusion to change are performing a valve job or refacing valves, sinking
Anything that changes valve stem protrusion also affects the needed pushrod length.Raises or lowers the rocker arm relative to the cam, it needs to be factored into the pushrod length. Using thinner than stock gaskets, and/or omitting the base gasket, to increase compression or improve squish clearance, is a very common practice in high performance motors.So when swapping parts you also need to be aware of changes to the overall height of the head. But in addition to that, some HD heads are taller or shorter than others, In particular, it's very common to "deck" a head to raise compression in a high performance motor. Changing the height of the cylinder head changes height of the rocker arm relative to the cam, and therefore it needs to be factored into the needed pushrod length.Your stock pushrods are designed to be within the acceptable length range even in the worst case tolerance stack-up situation.īut when we hot-rod these motors, it's very common to make changes that individually or cumulatively can change the needed pushrod length: If your motor is all stock, the answer is no. Pushrod length with travel limited hydraulic lifters Pushrod length with standard hydraulic lifters How do I evaluate and adjust pushrod length? Do I need to pay attention to pushrod length?
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