what pushrod length!?!? are the lifters fine?
what pushrod length!?!? are the lifters fine? hey guys , i have the comp 875-16 adjustable with 7.4 pushrods on my 09 denali.. the shop that installed it havent adjusted the lifters.. and when i asked then they said they never adjusted anything.. just bolt it right on -.-.. so im considering getting the LS7 lifters would they be fine with the 7.4 pushrods?? i also asked if they have a pushrods length checker.. no was the answer >.< anyways.. i drove it with the comp 875-16 and the 7.4 pushrods for about 5000 miles now.. do u guys think any damage has been caused.. the only problem i saw from the engine was a slight drop in oil pressure after 6000+ rpm.. there is ticking it however i find it normal it does that when i cruise i could here a light ticking sound..
Ahmad.
Ahmad.
I bet you have too much preload on those lifters? Need to get a pushrod checker and check your preload. Are the the "R" lifters? if so, they dont like
much preload. I would first check my preload and try proper pushrod length first, and see if noise goes away? easist and cheapest way to correct and see if it fixes your concern? I have found from my own experience that if you have too much preload engine seems to be in a bind and will not rev easy and you find valve bounce in 6000 rpm ranges. And yes valvetrain was noisey
ticking and so with to much lifter preload.
much preload. I would first check my preload and try proper pushrod length first, and see if noise goes away? easist and cheapest way to correct and see if it fixes your concern? I have found from my own experience that if you have too much preload engine seems to be in a bind and will not rev easy and you find valve bounce in 6000 rpm ranges. And yes valvetrain was noisey
ticking and so with to much lifter preload.
You need adjustable rockers to set the preload properly on those Comp OE-R lifters! They are VERY specific on their preload and you will not be able to hit the right amount 99.9% of the time changing pushrod length!
*note* im using stock rockers
Last edited by supercharged680; Jul 30, 2010 at 09:05 PM.
