You can't just pick a pushrod length. With valve jobs, milled heads, decked blocks, different cam base circles, different rocker types the pushrod length changes all over the place. You can't set the pre-load on a lifter without getting the pre-load spec from the lifter manufacturer and any manufacturer other than GM and the stock lifter may and likely will have a different pre-load spec.
No. So start out with zero lash, set your torque wrench to 22 ftlbs, then rotate until you click. If your in between 1 and 1 1/2 turns, your golden. If your short of that, you need shorter rods, if your longer than that, you need longer rods. Hope this helps
So basically number one is intake right next to it is exhaust when intake Rises up tighten to 22 lb move crank so intake goes down exhaust goes up torque that one to 22 lb etc correct ?
in your pushrod video it says 1/2 to 1 full turn but on this video it says between 1 and 2 turns, so which one is it to determine the correct pushrod length?
+marlboroman71818 It depends on the specific application. This particular video pertains to LS applications with factory-type lifters and rocker arms. With other aftermarket parts, the required pre-load may change. Be sure to follow the manufacturer's instructions that are included with specific parts. Hope this helps!
+COMP Cams both videos reference factory ls engines with non adjustable rockers and hydraulic lifters. So what is the lifter preload supposed to be 1/2-1 full turn or 1-2 full turns?
+marlboroman71818 There may be some variables in engine setup that alter the process. Your best option might be to call the tech line at 800.999.0853 for a more specific answer regarding your particular engine and lifters. Thanks!
do not listen to this lady from comp cams. ls7 lifters should have a preload of no more then .100 of preload but this vid says between 1 and 1 3/4 turns is acceptable wich wich at 1 3/4 turns ud be at around .140 wich is absolutely wrong . lol. so much bad info guys... ls7 lifter should have no more the 1 turn past 0 lash and thats straight from gm.
Correct! This is the first post I've found on the entire internet with correct numbers in it. The webs are FULL of the incorrect statement from people who can't do geometry that one turn at the rocker bolt = .047 at the pushrod when in reality it is .081 with stock rockers.
Its always rule of thumb to go 1/2-3/4 turn of preload. Anything more and you risk having a valve hanging open. Only sure fire way is with a push rod length checker and patience. That being said, I love Comp Cams.
Adjustable valves just don't work anymore because people can't adjust their valves lol Under good conditions a non adjustable head even with a cam will work just fine with proper length components
No music please. Just talk n instruct??
You can't just pick a pushrod length. With valve jobs, milled heads, decked blocks, different cam base circles, different rocker types the pushrod length changes all over the place. You can't set the pre-load on a lifter without getting the pre-load spec from the lifter manufacturer and any manufacturer other than GM and the stock lifter may and likely will have a different pre-load spec.
What do you mean by turns like after you put 22 foot pounds of tq on then the you tighten them more by how many turns you said ?????
No. So start out with zero lash, set your torque wrench to 22 ftlbs, then rotate until you click. If your in between 1 and 1 1/2 turns, your golden. If your short of that, you need shorter rods, if your longer than that, you need longer rods. Hope this helps
@@luamayav Doesn’t the video say the exact opposite though @ 2:09 in the video? What you say makes more sense.
So basically number one is intake right next to it is exhaust when intake Rises up tighten to 22 lb move crank so intake goes down exhaust goes up torque that one to 22 lb etc correct ?
So what are torque specs for a Pontiac Bonneville series 2 engine 3800 V6 rocker arms
Awesome help guys. Thanks.
Happy to help -- thanks for watching!
Would it be the same for Ford 351c? Preload?
What about shimming the rocker instead of longer pushrods?
shims are sometimes used if a pushrod is slightly too long , not short
@@44special9a shim is just gonna make it longer lmao that makes zero sense
in your pushrod video it says 1/2 to 1 full turn but on this video it says between 1 and 2 turns, so which one is it to determine the correct pushrod length?
+marlboroman71818 It depends on the specific application. This particular video pertains to LS applications with factory-type lifters and rocker arms. With other aftermarket parts, the required pre-load may change. Be sure to follow the manufacturer's instructions that are included with specific parts. Hope this helps!
+COMP Cams both videos reference factory ls engines with non adjustable rockers and hydraulic lifters. So what is the lifter preload supposed to be 1/2-1 full turn or 1-2 full turns?
+marlboroman71818 There may be some variables in engine setup that alter the process. Your best option might be to call the tech line at 800.999.0853 for a more specific answer regarding your particular engine and lifters. Thanks!
This is fire.
good job
Ver informative Gracisas😜
Check out our latest video to learn how to set pre-load with non-adjustable rockers.
Rocker arm
do not listen to this lady from comp cams. ls7 lifters should have a preload of no more then .100 of preload but this vid says between 1 and 1 3/4 turns is acceptable wich wich at 1 3/4 turns ud be at around .140 wich is absolutely wrong . lol. so much bad info guys... ls7 lifter should have no more the 1 turn past 0 lash and thats straight from gm.
Correct! This is the first post I've found on the entire internet with correct numbers in it. The webs are FULL of the incorrect statement from people who can't do geometry that one turn at the rocker bolt = .047 at the pushrod when in reality it is .081 with stock rockers.
Its always rule of thumb to go 1/2-3/4 turn of preload. Anything more and you risk having a valve hanging open. Only sure fire way is with a push rod length checker and patience. That being said, I love Comp Cams.
@@cptspalding32927 on an ls3 with a gt11 cam was getting 7/8 of a turn and lifters were noisey. Changed rods and getting 1 1/3 turns and perfect
Do you have a video of doing it properly?
What about shimming the rocker instead of longer pushrods
Seams like bs lol they want the rocker bolts to fall out
Chevy should have put adjustable valves on these heads, they're junk.
Bwahahahaaaa! WRONG.
no there not. these heads are on some of the best cars in the world lol..
Lmao
Your a dumbass sir
Adjustable valves just don't work anymore because people can't adjust their valves lol
Under good conditions a non adjustable head even with a cam will work just fine with proper length components