transwiz

iTrader: (26)

Ever since I had a cam and heads install on my motor,The engine has a ton of lifter noise.The thing was dead quiet before the mods.I pulled a valve cover and checked the lifters with the turns method a while back and the intake was
one turn and the exhaust was 3/4 turn. From all of my research on here are the pushrods slightly too short? I have read that you want to shoot for 1 1/2 to 1 3/4 turns.

Buy the way the mechanic that worked on the car overtightened the rocker bolts and I had to use a breaker bar to get the bolts loose to change the valve springs.One of the rocker threads on the cylinder head stripped and I had to install a helicoil on cylinder number 2 on the car. I am afraid to loosen the rocker bolts as they may strip out. I have another set of cylinder heads to go on the car but I am not ready.Loosening the rocker bolts could turn into a can of worms. What do you guys think about this?

vettenuts

iTrader: (4)

If that cam has fast lobes, like XER, the valve train will be noisier.

redtan

iTrader: (5)

Like vettenuts said, an aftermarket cam will cause more noise from the valvetrain. Although even with mild lobes and soft ramp rates my lifters and valve noise is more than stock.

So short of a stock cam, you're going to experience increased noise especially from the lifters.

01ssreda4

iTrader: (96)

Your preload is fine. The 1+ turn info is slightly incorrect. While its still in the range of plunger travel of the lifter, its on the upper end of acceptable.

tadams72

Ramp rates definitely play a part. What lifters are you running? 3/4 turn is around .035 - .040 preload which is spot on for a limited travel lifter like a Johnson but may be a bit light for a stock lifter although I am not convinced more preload will help much. Bottom line aftermarket cams and valvetrains can tend to create the sewing machine noise all of us LS guys learn accept.

transwiz

iTrader: (26)

I am running stock lifters. I have a baby cam 224/224 561/561 @115.From what I remember it does not have fast lopes.My friend has a much more aggressive cam with stock lifters and his car is dead quiet.My valvetrain noise is really loud.

tadams72

Shoot some video of the noise. Is it all cylinders or certain ones? What oil are you running? Pressure? New lifters?

Oh and if you had to use a breaker bar to loosen rocker arm bolts that is a problem cause he either WAY over-tightened them or used red loctite or something. That the makes me question the build.

transwiz

iTrader: (26)

no loctite or anything like that just over tightned. A couple of cylinders on the passenger side are louder than others.T he guys who worked on it kinda screwed things up. I was going to remove the top end and install my other heads and replace the lifters while in there and re do the top again.But I am not ready to do it now. A mechanic said he wanted to remove the valve covers and look around for $250.00 but I have already done that a couple of times.I don't see the point.

This build was really bad.The mechanics were idiots. The cylinder heads have valves that are too big.The tune was also bad. I had to have it dyno tuned again and the tune is not all that great.It is running slightly lean.It also will not pass smog so I have to have it fudged. The whole thing is a real pain.

01ssreda4

iTrader: (96)

No it isnt. 1 turn is around 80 preload, so 3/4 turn is 60. I know because Ive measured myself. The one turn = 47 is plain incorrect.

onebadbowtie86

iTrader: (13)

How did you measure? I used the comp pushrod length checker and count the turns with the tq wrench from zero lash and it seemed close to .050" to me?

Or are you saying even on the push rod length checker is closer to .080" then the advertised .050" per turn?

tadams72

Well I can tell you on square port heads it is cause I've set them up with a dial indicator more than once.

Regardless, stock lifters have something like .190" travel and the factory sets them up in the middle to upper half preload so keep that in mind. Again, not convinced this is your problem though.

tadams72

Unless proven otherwise, stick with .050. If you don't have a dial indicator you should get one. Takes the guess work out. I use dial indicator, adjustable pushrods, and a dial caliper to measure preload and pushrods length.

onebadbowtie86

iTrader: (13)

I do have a dial indicator, I will have to give that a try instead of using the adjustable push rod.

01ssreda4

iTrader: (96)

Sorry we may be miscommunicating. Yes one turn of the checker is 50. The myth of the 1 1/2 turns past zero lash was what I was refuting. I'm currently running 120 preload on a softer lobe cam with zero issues....very quiet also.

Darth_V8r

iTrader: (4)

that's right ****** on there. 1 turn = 048 is on the rocker bolt thread pitch, not the lifter preload. I calculated out 076, but I use 075 for easier math off the top of my head.

vettenuts

iTrader: (4)

I found in that one turn, 1/3 turn is for bolt preload and not actually applying preload due to rocker bottoming. By calculation I get 2/3 turn of the bolt to preload and 0.052" of lifter preload after correction for the rocker ratio. I also verified it with a dial indicator.

01ssreda4

iTrader: (96)

Interesting.....

big hammer

I prefer like 1/4 turn

Kip Fabre

It does not matter if it's a baby cam or a cam with higher lift that has nothing to do with how aggressive or vilant the design is. We can make a lobe with the same duration and .600 + lift and not have valve noise. It the lobe design most of the time not the lifter preload.

Jase01

EPS 222/226, .595" (Cam Motion core/grind) and Johnson 2126's at .035" preload here, as quiet or quieter than standard.

Jason.