my valves won't close help
Thread Starter
Teching In
Joined: May 2009
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my valves won't close help HI Guys.
ok so I installed the g5x3 114 cam, got my felpro gaskets 0.41 and my heads milled to 62cc
i put some checking springs to check my piston to valve clarance
i notice when tighting my rockers the valves open and when rotating enigne by hand many revolutions the valves never close all the way. I beleive i need shorter pushrods. has anyone had this problem.
ok so I installed the g5x3 114 cam, got my felpro gaskets 0.41 and my heads milled to 62cc
i put some checking springs to check my piston to valve clarance
i notice when tighting my rockers the valves open and when rotating enigne by hand many revolutions the valves never close all the way. I beleive i need shorter pushrods. has anyone had this problem.
Non adjustable rockers means you NEED to check for proper pushrod length.
Comp Cams #249-7702-1
Pushrod Length Checker, 6.800'' - 7.800''
That comp cams pushrod checker can be found for $17 or less if you look hard enough.
THEN
Check these out. I didn't read or watch all of them but they should get you where you need to be.
http://www.compcams.com/information/Products/Pushrods/
http://www.carcraft.com/techarticles...th/index1.html
http://www.youtube.com/watch?v=qw5PWiOwXhI
Comp Cams #249-7702-1
Pushrod Length Checker, 6.800'' - 7.800''
That comp cams pushrod checker can be found for $17 or less if you look hard enough.
THEN
Check these out. I didn't read or watch all of them but they should get you where you need to be.
http://www.compcams.com/information/Products/Pushrods/
http://www.carcraft.com/techarticles...th/index1.html
http://www.youtube.com/watch?v=qw5PWiOwXhI
How exactly are you checking PTV? Are you using solid lifters? If so, you need to be at zero lash before checking. Are you using the dial indicator method? Need a lot more information.
Also, that video is for stud mounted rockers and doesn't apply to a shaft mounted rocker. The video is showing how to set the wipe pattern, which with stud mounted rockers it is set with pushrod length. For the shaft mounted LS1 rockers, you set the wipe by adjusting the rocker mounting height with either shims or removal of material from the rocker stand.
Also, that video is for stud mounted rockers and doesn't apply to a shaft mounted rocker. The video is showing how to set the wipe pattern, which with stud mounted rockers it is set with pushrod length. For the shaft mounted LS1 rockers, you set the wipe by adjusting the rocker mounting height with either shims or removal of material from the rocker stand.
Thread Starter
Teching In
Joined: May 2009
Posts: 9
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ok so i measure my push rod lenth they are 7.4
I even called LG and they said they have milled even more off the heads and have used the same push rods with no problem, also said that cam fits F body and Y body.
is the cam circle larger on the g5 ? still wondering why the valves ani't closing all the way when others have used this combo with no problems ....
I even called LG and they said they have milled even more off the heads and have used the same push rods with no problem, also said that cam fits F body and Y body.
is the cam circle larger on the g5 ? still wondering why the valves ani't closing all the way when others have used this combo with no problems ....
I'd bet your pushrods are too long!
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ok so i measure my push rod lenth they are 7.4
I even called LG and they said they have milled even more off the heads and have used the same push rods with no problem, also said that cam fits F body and Y body.
is the cam circle larger on the g5 ? still wondering why the valves ani't closing all the way when others have used this combo with no problems ....
I even called LG and they said they have milled even more off the heads and have used the same push rods with no problem, also said that cam fits F body and Y body.
is the cam circle larger on the g5 ? still wondering why the valves ani't closing all the way when others have used this combo with no problems ....
We are asking you to measure the distance from the lifter to the rocker. Not the actual pushrod. Although it is good to double check things.
Get the checker pushrod and expand it until you achieve the proper wipe pattern then measure the checker. that's the pushrod length you need.
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This may be a stupid question but.
Just out of curiosity is this only happening on the valves that the check springs are on?
The check spring may not be strong enough to close the valve all the way.
Just out of curiosity is this only happening on the valves that the check springs are on?
The check spring may not be strong enough to close the valve all the way.
Thread Starter
Teching In
Joined: May 2009
Posts: 9
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ABQ99TA <----- yeap , i just put the full valve train assembly on and rotated many times all the valves close.... finally, check springs don't close them, i just found that out after playing around with that all day...
We are asking you to measure the distance from the lifter to the rocker. Not the actual pushrod. Although it is good to double check things.
Get the checker pushrod and expand it until you achieve the proper wipe pattern then measure the checker. that's the pushrod length you need.
Get the checker pushrod and expand it until you achieve the proper wipe pattern then measure the checker. that's the pushrod length you need.
How are you checking PTV, which was your original question?
