painterman52

I`ve got a 383 with an xe274h cam. The motor runs great. no issues except the valvetrain seems to be on the noisy side, not any one valve but overall louder than I like. Is this normal with the xe comp cam?

ZZ71S

Whats it sound like

7T1vette

If your engine has hydraulic lifters or roller lifters, it shouldn't be noisy. If you have solid, flat tappet lifters, there will be some noise. Sounds like improper 'lash' adjustment or you have an abnormal wear issue due to valvetrain geometry or inadequate lubrication.

Brooklinite

Has it always been noisy or is this a recent development?

ajrothm

You may need a touch more preload. What rocker arms? Ofcourse it could just be the aggressive lobes of the XE series.....and/or the type of lifters. Could be completely normal. I have a hyd roller on a billet core and Morel hyd roller lifters and mine make a decent amount of noise. When completely warm, it's not too bad, actually have to lean down some and listen for it, but definetly louder then a stock hyd flat tappet setup....when cold, they clatter like mad for a few mins....adding another 1/8 turn of preload(now at 1/4 turn) helped a tad but it's still rough when cold.....just the nature of the beast...

Becareful adding more preload so you don't get your valvetrain geometry off...

painterman52

They are hydraulic flat tappet. If I adjust them with the motor running I just back off till it makes noise then tighten till quiet and stop. no more 1/2 turn. It might not be the best way for adjustment. but it sounds easy. I have covers with the tops cut out and the rockers are rollers so not a lot of oil all over.

7T1vette

If you don't add 1/2-3/4 turn more on the hydraulic lifters, you are not really using them. When the "lash" is removed to the point that the clacking noise on that lifter is quieted, you have just set the adjustment at the beginning of the piston travel in the lifter. You need the additional 1/2 to 3/4 turn (CW) to center the piston in the lifter so that it will work properly. That is likely where your 'noise' problem resides.

DRIVESHAFT

The XE hydraulic cams are known to be noisy fairly often.

The Money Pit

I ran both an XE-274, and XE-284 in my 406. Sounded like a sewing machine, so I guess that is normal. My Isky solid is much quieter now, and the added plus is the 7000 rpm top end.

SteveG75

XE is noisy due to the aggressive lobe design.