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
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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..
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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..
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