Pushrod length and preload help
Pushrod length and preload help I am building a 5.3 for my iroc. I am using a comp cams 7702 length checker. I noticed that my exhaust pushrod would be small then my intake. Is this normal? Should I still run the same size rod? Also, what is a good preload with possible supercharger later on?
Preload depends on your lifter and can range from .020 to .080. I have to use two different pushrods for intake and exhaust to get the .035 preload I was looking for.
Staging Lane
Joined: Aug 2014
Posts: 50
Likes: 0
From: Detroit, MI
I could be wrong, but aren't you supposed to measure the pushrod length at zero lash, then add you preload to the length to get the size you need? I also believe your supposed to use a solid lifter or checking springs on your valves so the lifters don't bleed down when your attempting to take measurements? Maybe someone else could clarify a little better?
I could be wrong, but aren't you supposed to measure the pushrod length at zero lash, then add you preload to the length to get the size you need? I also believe your supposed to use a solid lifter or checking springs on your valves so the lifters don't bleed down when your attempting to take measurements? Maybe someone else could clarify a little better?
In you're case I would run 7.350 PR's and it will give you .075 preload on the intake side and .050 on exhaust side.. ls7 lifter's are typically ran .050-.080 on average so you are still well within that range..
Trending Topics
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
yes, find zero lash with the PR checker.. add desired preload amount to that...
In you're case I would run 7.350 PR's and it will give you .075 preload on the intake side and .050 on exhaust side.. ls7 lifter's are typically ran .050-.080 on average so you are still well within that range..
In you're case I would run 7.350 PR's and it will give you .075 preload on the intake side and .050 on exhaust side.. ls7 lifter's are typically ran .050-.080 on average so you are still well within that range..
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
