1Loudz28

iTrader: (47)

just this week i noticed that my valve train sounds like a sewing machine and i can hear it inside my car with the windows up over my magnaflow. the motor has been idling harder than the hotcam i had in on a 112lsa. right now i have a tsp 224r .581/.581 114lsa and comp 918s. im running mobil 1 10w30.

is this normal? should i be running a heavier weight oil?

BayAreaSS

iTrader: (10)

What length are the pushrods? I went with 7.425 instead of 7.4 and my valvetrain sounds like it did when it was stock

1Loudz28

iTrader: (47)

theyre 7.4s

BayAreaSS

iTrader: (10)

If i remember correctly, pushrod length is what has to do with the sewing machine noise. Maybe someone with a little more knowledge than myself can chime in. I would do a search on the sewing machine issue and see what length pushrods guys were using to quiet down the valvetrain

BarneyMobile

iTrader: (4)

I would also like to know how to quiet down my valve train, I have a 224/220 cam and the valve train is noticeably louder than stock but I can't really hear it with the windows up. I know its annoying as hell when I have the windows down and I'm next to the center median.

1Loudz28

iTrader: (47)

WORD.

socmguy

iTrader: (18)

LS1s are known for their sewing machine sound. Those 7.425PRs may be what you need to quiet her down a little.

Mac 2002 SS

iTrader: (6)

how many qts of oil are you using ? i had a similar problem and i was only using 5.5 qts after my h/c install. once i added another .5 qt ,belive it or not ,my valvetrain quiet down and everything seems to be getting along just fine. i found out that 6 qts is the magic number after all.

1Loudz28

iTrader: (47)

am i gunna majorly damage the valve train if i dont switch the 7.425s soon?

yeah i always refill with 6quarts of oil...anyone have experience with using a heavier weight oil to quiet this down?

ill try and upload a video of the t shirt factory under my hood tomorrow.

brad8266

iTrader: (23)

You wont damage it, youll just have to deal with the sound. 7.425 may not be the magic number for your setup, but a pushrod checker and measure the proper length you need.

Check your rocker arms for needle bearing loss too, once some of the needle bearings are lost the valvetrain will get noisier.

FYI I have a head cam car and my valvetrain is very quiet, even with the fast intake which usually makes you able to hear the valvetrain even more.

1Loudz28

iTrader: (47)

^^^ yeah i swear my setup was much quieter than it has been the last few days. thanks for the tips.

MrDrezzUp

iTrader: (1)

lol!ol!l!lol