A Pushrod calculation tool is useful for a mechanic or a DIY enthusiast. If you e]want to know the perfect optimal length of push rods for your engine. Simply enter overall length and ball diameter the calculator evaluate the required length in the result field.
In the engine valvetrain system, pushrod length is an important measurement. Pushrods are used in overhead valve engines to transfer the motion from the camshaft to the valve lifter or rocker arm and, therefore, to actuate the valves. Correct length results in proper valve timing and clearance,. Performance and efficiency are two very important considerations for good engine.
User Guide
Input  Action 

Overall Length (OL)  Enter the overall length (e.g., 8.5 in). 
Ball Diameter (BD)  Enter the ball diameter (e.g., 0.5 in). 
Click Calculate  Displays the pushrod length (PR). 
Pushrod Length Formula & Calculation
Calculate pushrod length with:
$\text{PR} = OL – \frac{BD}{2}$
Variable  Description 

PR  Pushrod Length (inches) 
OL  Overall Length (inches) 
BD  Ball Diameter (inches) 
Calculation Example 1
Here’s how to determine the pushrod length.
Step  Calculation 

Overall Length (OL)  8.5 inches 
Ball Diameter (BD)  0.5 inches 
Divide BD by 2  $0.5 / 2 =$

Subtract from OL  $8.5 – 0.2$
inches 
Answer: The pushrod length is 8.25 inches
Calculation Example 2
Examples below show basic and advanced pushrod calculations.
Example Type  Input Values  Pushrod Length (PR) 

Basic Calculation  OL = 8.5 in, BD = 0.5 in  8.25 in 
Advanced  OL = 8.5 in, BD1 = 0.5 in, BD2 = 0.6 in  7.95 in 
Pushrod Length Chart
A quick guide for various pushrod lengths based on typical overall and ball diameters.
Overall Length (in)  Ball Diameter (in)  Pushrod Length (in) 

8.5  0.5  8.25 
9.0  0.6  8.7 
9.5  0.7  9.15 
FAQs
What is a pushrod?
A pushrod transfers motion from the camshaft to the valve in an engine.
Why is pushrod length important?
The correct pushrod length ensures precise valve timing and optimal engine function.
How do I know if my pushrod length is incorrect?
Signs include poor performance, unusual noises, and potential engine wear.
Final Words
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