i have pro mag 1.6 NSA with guideplates and moly 7.150 pushrods. i've ajudted them over and over again and can't seem to get them quiet on the comp r's. yes, the preload is right. i got it making a lighter ticking noise one time. i tried again and it got louder. i was wondering if it is just supposed to be that way o what. they were all adjusted and preloaded right. the comp r's are good and the clips are still together. i'd also like the think that the pushrods are a hair too short, but when compared to stock (7.20"), the 7.150" made a better wear pattern closer to the center of the valve. i hate to put 7.20's back in since i have a milled heads and a decked block.
searching for suggestions....

 

Roller rockers are going to be a little noisey. I have crane rockers and they definately make a small clattering sound when ajdusted properly.

 

Mine don't make hardly any noise. I adjusted mine with the car running so I'm pretty sure they're set right. Good luck.

 

They are supposed to sound like a sewing machine, or so ive been told.

 

The valve train will make a slight noise when adjusted properly. If you think it's a little to loud then it's not right. In my case I had to have Speed Inc. adj. mine to make it right. Setting it at zero lash is not going to be easy to do the first time, if you have not done it before.

 

i have done this many times. never had a problemuntil now. i'd like to blame it on the comp r's. way too picky

 

My valve train is noisy. Every one else that I know who has had an LT-1 F-body has had a noisy valve train with roller rockers also. My valve train is more noisy than before the engine rebuild.

ZMAN

 

Bingo

Driving next to a wall or another car... oh boy do they chatter (GM 1.6 RR).

As long as they are not "clacking"...

 

Its the Comp R's. They always clack, and if you have the newer style Comp R's they've probably blown the little clips out of the lifter.

 

when i pulled the rockers off, i checked the pushrods as well. everything checked out ok. i also peeked through the pushrod area into the tops of the lifters. they all apeared to have the clips in tact. the clacking is not "****, i broke something" loud. the clack also seems to get better when u give it gas. it apears to only be clicking and clacking at idle. one the drivers side is fairly quiet, but there's something on the passenger side that is slightly louder. I had gmpp 1.6 SA rockers before this and i don't remember them being loud at all.

 

Well i would almost put money on the clips being damaged. 8 of my Comp R's had damage or no clips in them when i did my cam install. I was forced to put in 8 comp R's and 8 stockers. I then pulled the intake a few weeks later to replace all the lifters with stockers and another Comp R had lost its clip. I know the second time the rockers were adjusted correctly.

 

as i stated before, the lifters already have 3k miles on them from a previous motor, and all the clips are stil in tact. if they are damaged, it is something that is not visible. i doubt they are though, as the clacking changes every time we adjust the rockers. i guess it's just a matter of fine tuning the rockers.

 

I would take another look at those lifters. I just recently had one lifter (I run Comp R's) lose its retainer. I am now looking at either Cranes or stock replacements. I had the same problem where I couldnt get the adjustment right on one rocker, and now I know why.



Nick

 

the lfiters already had miles on them so they should be good. i doubt running the car at idle (with preload correct) would make it loose a clip. it's already had 6500 rpm runs, dyno runs and 3k miles on them to break....i doubt they would now. the clacking is not very loud at all. like i said earlier, it doesn't run or sound like a broken lifter. it runs very strong.

 

Mine make a ton of noise (GMPP 1.6 rockers, stock length pushrods, roller lifters and a hotcam). They dont clack, just make a lot of noise and i adjusted them too.