Rocker noise

[AMXguy]

How much rocker noise is acceptable? after running my new 440 six pack a while I still have a little top end noise on it sounds like 2&4 . it's most noticable around 1500 rpm and you have to have your head under the hood to hear it. I have the crane ductile rockers so I'm pretty sure I just have a loose one or two, is this going to hurt anything or is it worth worrying about? if I didn't have a new show quality paint job and everything detailed out under the hood I'd just fix it but I really don't want to mess with it if it isn't really a problem.

[Moparal]

If it goes over 35 thou or so , and you rev it too high, then the push rod could come off the tip. But some cams and most solid lift cams will make noise anyways. Set it to spec and not to decibal

[Chryco Psycho]

 
 Make sure it is adjusted while hot to the specs for your cam , every cam is different

[AMXguy]

I set the preload a little on the light side, and at room temp of course on the engine stand.  hot it should have more preload right? it's a hydraulic cam with an improved six pack grind.

[Chryco Psycho]

not nessisarily , the heads expand too so you can end up loose hot not tight
 actually I set all my solids tight cold for the first run & then check hot & most have too much play & need to be adjusted tighter

[AMXguy]

Interesting, well it's not that much work I guess I'll just pull the cover and tighten them a bit. do you think I could get away with just giving them all a 1/4 turn or something or should I run through the whole adjustment proceedure again? I set them up with 3/4 of a turn preload cold.

[Chryco Psycho]

I would set them all properly

[72bluNblu]

Interesting, well it's not that much work I guess I'll just pull the cover and tighten them a bit. do you think I could get away with just giving them all a 1/4 turn or something or should I run through the whole adjustment proceedure again? I set them up with 3/4 of a turn preload cold.

I'm no expert by any means, but stock type hydraulic lifters are supposed to be set with .020-.060" of preload. Later, "anti pump up" hydraulic lifters take less, more like .020". But these should be based on the specs for your lifters.

I've also heard that with the newer, faster ramp cam grinds (like Lunati's) the lower preload numbers should be used, and that even with hydraulic lifters these cams tend to make the valvetrain a little noisy because of how fast they ramp up/down.

Find the specs for your lifters, and set the preload accordingly. Also, find out the thread pitch for the adjusters. My Harland Sharp adjusters are 7/16"-20's, so, 1"/20 threads = .05" per full turn of the adjuster. You may also want to check to make sure you don't end up with too many threads showing below the rocker, that would be specified by the rocker. For the Harland's you're supposed to have no less than 0 and no more than 2 threads showing below the rocker to get the right geometry. Any more/less, you need different length push rods.