Valvetrain noise
Thread Starter
Cruising
Joined: Feb 2023
Posts: 14
Likes: 3
Valvetrain noise
Hey everyone, I just finished up doing a cam swap. I got the ls2 tsp bald eagle cam kit, 7.4 pushrods, dual valve springs, valve spring retainers and valve stem seals. I also ordered morell ls7 style lifters. Picked it up from the tuner yesterday and i had absolutely no issues. This is my first time installing a cam kit. i did everything correctly but after reading forums i realized that i didn’t torque the rockers correctly but i’m not sure if it would cause something this bad. My coworkers are saying the pushrods might be too short? My only concern with that is that people are running the same setup as me lifters and all and aren’t having this problem. So i’m leaning more towards the rockers not being torqued correctly. Any advice will be greatly appreciated.
Race Director
Joined: Mar 2011
Posts: 13,262
Likes: 3,151
From: SW Florida
2021 C6 of the Year Finalist - Modified
Recommended preload for the Morel 7717 lifters is .060"
That is 3/4 of a turn of the rocker arm bolt from zero lash to 10 Ft/Lb torque of the bolt. Once you have selected a pushrod length that will give you the 3/4 of a turn, don't forget to then tighten the bolt the rest of the way to 22 Ft/Lb.
_______________________________
The information below has to do with using the stock LS valve lifter, but you can see that 3/4 turn of the bolt will equal the .060" preload your Morel lifters need.
Attachment 48331326
That is 3/4 of a turn of the rocker arm bolt from zero lash to 10 Ft/Lb torque of the bolt. Once you have selected a pushrod length that will give you the 3/4 of a turn, don't forget to then tighten the bolt the rest of the way to 22 Ft/Lb.
_______________________________
The information below has to do with using the stock LS valve lifter, but you can see that 3/4 turn of the bolt will equal the .060" preload your Morel lifters need.
Attachment 48331326
Thread Starter
Cruising
Joined: Feb 2023
Posts: 14
Likes: 3
Recommended preload for the Morel 7717 lifters is .060"
That is 3/4 of a turn of the rocker arm bolt from zero lash to 10 Ft/Lb torque of the bolt. Once you have selected a pushrod length that will give you the 3/4 of a turn, don't forget to then tighten the bolt the rest of the way to 22 Ft/Lb.
_______________________________
The information below has to do with using the stock LS valve lifter, but you can see that 3/4 turn of the bolt will equal the .060" preload your Morel lifters need.
That is 3/4 of a turn of the rocker arm bolt from zero lash to 10 Ft/Lb torque of the bolt. Once you have selected a pushrod length that will give you the 3/4 of a turn, don't forget to then tighten the bolt the rest of the way to 22 Ft/Lb.
_______________________________
The information below has to do with using the stock LS valve lifter, but you can see that 3/4 turn of the bolt will equal the .060" preload your Morel lifters need.
Race Director
Joined: Mar 2011
Posts: 13,262
Likes: 3,151
From: SW Florida
2021 C6 of the Year Finalist - Modified
And you will need to be able to 'tap' the starter in order to get the crankshaft in the correct position when following the steps I outlined above.
Just pull the starter relay and bend a metal paper clip into a U-shape. Then touch the two pins shown below ... This will tap the engine in the position you want (you won't get any fuel or spark while doing this).
Attachment 48331324
Attachment 48331325
Just pull the starter relay and bend a metal paper clip into a U-shape. Then touch the two pins shown below ... This will tap the engine in the position you want (you won't get any fuel or spark while doing this).
Attachment 48331324
Attachment 48331325
