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Old 04-24-2012, 07:52 PM
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My valves are too loud!!

Hello anyone, I have a 496 big block everything new. I hear what I assume is valves clacking over my mufflers. It's annoying, cannot adjust it out, it's not exhaust leaks or valve covers. It idles rough enough to shake the whole truck. I can feel knocking on the rocker studs, I checked rocker clearance and no contact. I'm out of ideas. Iron block, aluminum heads cam 567 lift 246 duration, 1:7 roller rockers. Any ideas will be very helpfull, thanks.

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Old 04-24-2012, 08:07 PM
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Hard to tell from the info. Hyd roller, they're going to be loud. Got one in my deuce, it's loud. Set the valves hot. I run 15w40 in mine to help quiet it down. Puta screwdriver on the valve cover while it's running to verify it's coming from the valve cover. If not, chase it down.
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Old 04-25-2012, 05:38 AM
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Check for correct pushrod length. BBC's usually need custom pushrods with non-stock builds. Or you have pistons contacting the heads, another common problem. Especially with some Edelbrock heads.
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Old 04-25-2012, 10:02 AM
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How's the oil pressure?
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Old 04-25-2012, 11:34 AM
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Hydraulic or solid lifters?

Flat tappet or roller?

Rocker body hitting stud?

Cam degreed in and specs verified at assembly?

Piston to valve clearance?
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Old 04-25-2012, 11:36 AM
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Rocker hitting the v-cover? Exhaust leak?
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Old 05-21-2012, 07:24 PM
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Valves are to loud

First of all, thanks for your replies. No exhaust leaks, oil press good rockers are clear of studs and valve covers. Lifters are hyd. Flat. Don't know about cam degree or piston clearance, this is the first engine I DIDN'T build, trying to save time, now I'm spending way more time on this than if I'd done it my self....Lesson learned. I'm starting to think the cam is the wrong size. In it now is an Elgin 576 lift, 246 duration. What should be in a 496 for mostly street use?valve noise has gone down a little after changing guide plates but still shakes so bad it feels like the doors are going to fall off.
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Old 05-22-2012, 01:41 AM
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If you are truly concerned,and believe there is a problem, take the motor back to the builder. He should stand behind his work, if there is a problem.

Keith
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Old 05-22-2012, 05:11 AM
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What size studs? Possibly 7/16 rockers with 3/8 studs? Probably not the case but you never know.
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Old 05-22-2012, 02:37 PM
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Are you getting oil up top to the rockers?
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Old 05-22-2012, 06:45 PM
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yes, plenty of oil. I noticed some of the lifters were spongy after shutting it off, I'm going to change them and see if that helps, thanks.
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Old 05-22-2012, 06:50 PM
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The builder is in Ca and I'm in Tx, all he says is adjust the valves which I've done repeatedly, he is no help. The rockers and studs are both 7/16.
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Old 05-22-2012, 07:28 PM
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I've got a BB in my T, with valve cover extenders to raise the cover for rocker clearance. With heavy PRW roller rockers that came with it, they hit the valve cover lift extension on the top side, some have been ground down, but a couple still hit when it warms up.
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Old 05-22-2012, 09:33 PM
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Quote:
Originally Posted by Bonebreak
I noticed some of the lifters were spongy after shutting it off, I'm going to change them and see if that helps, thanks.
Not a good idea, changing just the lifters on a FT cam that's been run in w/a different set of lifters. More here.
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Old 05-23-2012, 12:26 PM
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non stock .576" lift cam with stock GM rocker arms. Rocker arms slot is binding with the stud. Need long slot rockers. Worn cam lobes.
Wrong valve springs coil binding.
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