How Tos / Tech / Videos & Galleries

Video: How to Set Lifter Pre-Load on a Small Block Chevy Engine

Watch this video from Power Nation and Summit Racing, and let tech expert and OnAllCylinders contributor Jeff Smith show you how to set lifter pre-load on a small block Chevy engine.

It’s as simple as remembering to abbreviations—EO and IC.

EO is exhaust opening. IC is intake closing.

First, Smith walks you through the manual turning over of our engine until the exhaust valve is one-quarter open. This EO position puts the intake lobe on the base circle. Smith then shows you how to find zero lash by tightening your intake rocker adjustment nut to complete your intake preload.

Next, Smith shows you how to turn the engine until the intake is three-quarters closed (IC), where you then tighten the adjuster nut after finding zero lash.

Repeat that process for each cylinder, and lifter pre-load is set.

Check it out here:

Tags: , , , ,


  1. Pat Riordan says:

    What header would you recommend for a 1976 Corvette with a ZZ4 crate engine taking into consideration clearance issues and the “D” shape exhaust ports?

    • OnAllCylinders says:

      Pat, we’d recommend you call the tech line at 330-630-0240 as there are some follow-up questions that will need answered.

Leave a Reply to OnAllCylinders Cancel

Your email address will not be published.


This site uses Akismet to reduce spam. Learn how your comment data is processed.