Pushrod length help
Thread Starter
Launching!
Joined: Apr 2021
Posts: 245
Likes: 108
From: New Athens IL
Pushrod length help Does this sound correct?
ls3 block decked
tfs milled .060
tsp cam .625 lift
Felpro .041 head gasket
Morel 5290 lifters
Stock rockers
Started with 7.350 pushrod
Cam on base circle
1 full turn on intake
7/8 turn on exhaust
I then used my pushrod length checker and was getting 9.75 turns for zero lash. Comes out to...
to 9.75 turns = .4875 + 6.8 total of 7.2875
then add lifter preload of say .040-.050
put me at a total length of 7.327 to 7.337
Should I go with 7.325 or stay with 7.350??
ls3 block decked
tfs milled .060
tsp cam .625 lift
Felpro .041 head gasket
Morel 5290 lifters
Stock rockers
Started with 7.350 pushrod
Cam on base circle
1 full turn on intake
7/8 turn on exhaust
I then used my pushrod length checker and was getting 9.75 turns for zero lash. Comes out to...
to 9.75 turns = .4875 + 6.8 total of 7.2875
then add lifter preload of say .040-.050
put me at a total length of 7.327 to 7.337
Should I go with 7.325 or stay with 7.350??
I personally like to set up my hydraulic builds at the deeper end of the preload spectrum. It makes for a quieter lifter in my experience. Also remember your dealing with aluminum block/heads here, so thermal expansion of .010 is normal at temp…which adds to the value of setting up preload at the deepest side of recommended preload.
Thread Starter
Launching!
Joined: Apr 2021
Posts: 245
Likes: 108
From: New Athens IL
I personally like to set up my hydraulic builds at the deeper end of the preload spectrum. It makes for a quieter lifter in my experience. Also remember your dealing with aluminum block/heads here, so thermal expansion of .010 is normal at temp…which adds to the value of setting up preload at the deepest side of recommended preload.
7.350 sounds right then unless your talking about running more preload than .050??
TECH Fanatic
Joined: Dec 2017
Posts: 1,622
Likes: 1,096
Just keep in mind, if you order off the shelf, they are most likely going to be .012"-.015" longer than what they are advertised as. If you need the exact length or close to it, I suggest ordering from Manton. This last set I got from them was within .003".
