butters02z

ok i have just installed a set a heads and a cam the cam is 580 lift now i have a pretty loud ticking noise i think it is from the lifters but not sure what is the best way to tighten down the rockers becuse i have read all kinds of ways i not even sure if that is what is wrong but i have no other ideas i have 50psi for oil but out of ideas please help

Gregorya24

iTrader: (13)

are all of your rockers torqued down to 22 foot lbs?

muayyadf1

I have the same thing, I will try to torque the rockers to 25ft/lbs.

Rotate the engine many times then re-check..

BAD2000TA

iTrader: (6)

It's 22 pounds. You DON'T want to break a bolt in the rocker stand.

KennethS

Does it go away after warm up? Hydraulic lifters? Are you sure it is not a exhaust manifold leaking?

sidewayz28

iTrader: (24)

your going to have to get used to a loud valvetrain

muayyadf1

Well, I torqued them before to 22 pounds, when I tried to torque them for more, the bolt didn't go more, my torque wrench just clicked immediatly.

guess loctite made them tight!

Raffman

iTrader: (8)

Did you use a pushrod checker..? a milled head or different base circle cam will change the length.

butters02z

the push rods are right i asked the guys from speed inc and he said the push rods are good and it starts making noise after it warms up

Tom@SpeedInc

iTrader: (5)

stock length is 7.400"

we have used 7.425" pushrods in cam swaps.

only way to tell is by using a length checker.

MrElectric03

iTrader: (71)

Im having a similar problem...I used a length checker but its telling me that I should have a 7.405" pushrod for .080" of lifter preload. SO I should have .075" of preload which is ok. It is still very loud and only after warm up. I am going to check the pushrod cups on my yella terras to be sure one didnt fall out and maybe measure my pushrods with a digital caliper and after that I may buy the 7.425 pushrods just to see if it make a difference.

Gregorya24

iTrader: (13)

are your lifters good?

DaddySS

At .075 you are at the low end and many builders recommend .080 to .100 (.125 is the max). So if you have a noisy valvetrain, it seems to me that 7.425 would be a good choice.

Raise

iTrader: (31)

Ive done many head/cam swaps and the valvetrain noise is always more prominent.

butters02z

i just looked i am using 7.400 push rods so you think i should get some new ones the specs on my cam is 225/229 .580''/.590'' and ls6 style heads 2.02'' / 1.57''/64cc anything will help

LS1-450

iTrader: (33)

How's your valve wipe pattern look? If not centered & your tick is due to short push rods, then try 7.425" push rods.


FYI, I have adjustable rockers & have experimented with setting pre-load from 0.080" all the way to.125" on LS7 lifters, without causing any problem w/ the lifters. So don't be weary of using a longer push rod that results in a deeper pre-load, on your non-adjustable set up.

butters02z

i am going to try to adjust the rockers and see what happens what is the proper way to do this i have no idea all i see is tighten to 22ftlbs and that is it anything else

LS1-450

iTrader: (33)

You can't adjust stock rockers. Only way to change wipe pattern/lifter pre-load is w/ different length push rods. This is why many people in this thread have suggested longer pushrods.

vettenuts

iTrader: (4)

Here is the procedure, but you are fishing in the wrong pond. First, did you check the wipe pattern to ensure you have the correct rocker geometry. Once you have the correct geometry, determine pushrod length by measuring to obtain correct preload on the lifter. Everything else is a shortcut. You can tighten the rockers until the bolt strips, if they are tight it won't make any difference. All you are doing by tightening more is loading the aluminum threads more.

butters02z

how do you check wipe , i went out today and it sounds like it is just 1or 2 lifters making noise