Product Description
Michigan Motorsports 6.800–7.800-Inch Adjustable Pushrod Length Checker / Measuring Tool
Measures Pushrod Length from 6.800 to 7.800 Inches with 0.050 Inch per Complete Revolution
Determine the correct pushrod length for your engine and valvetrain combination with this adjustable measuring tool from Michigan Motorsports. Precision-crafted from steel alloy with a black oxide finish, this checker measures pushrod lengths between 6.800 and 7.800 inches. Its easy-to-read design allows measurements to be determined without an expensive set of calipers, while each complete revolution changes the tool length by 0.050 inch.
Key Features & Benefits
- 6.800–7.800-Inch Measuring Range: The adjustable design measures pushrod lengths from 6.800 through 7.800 inches. This one-inch range allows the tool to evaluate numerous valvetrain combinations before the corresponding fixed-length pushrods are selected.
- 0.050 Inch per Complete Revolution: Each complete revolution changes the overall checking length by 0.050 inch. This defined adjustment rate makes it easy to track the tool’s position and calculate the measured pushrod length during valvetrain setup.
- Easy-to-Read Measurement Design: The tool’s unique design provides a straightforward method for reading the pushrod-length measurement without relying on expensive calipers. This simplifies the process of determining the zero-preload length and calculating the required finished pushrod.
- Steel-Alloy Construction: Precision-crafted steel-alloy construction provides a solid measuring tool for repeated engine-building and valvetrain-setup projects. A black oxide finish completes the tool and helps preserve its clean, professional appearance through continued use.
- Supports Proper Rocker Arm Geometry: Correct pushrod length is critical to establishing the intended rocker arm geometry and lifter preload. This checker allows the required length to be measured using the actual cylinder-head, lifter and rocker-arm combination being assembled.
Measuring Instructions
- Make sure the lifter is positioned on the base circle of the camshaft lobe.
- Torque the rocker arm to the required specification. The supplied specification for stock rockers is 22 lb-ft.
- Adjust the checking tool until the valvetrain reaches zero preload.
- Read the length shown on the tool, then add the required lifter preload to determine the finished pushrod length.
Measurement Example
Michigan Motorsports recommends 0.070–0.100 inch of preload when using an LS7-style lifter. If the checking tool measures 7.330 inches at zero preload and 0.070 inch of preload is selected, the required pushrod length would be 7.400 inches: 7.330 + 0.070 = 7.400.
Key Fitments
- For measuring pushrod lengths between 6.800 and 7.800 inches
