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Lose vales on a98 votec 350 chev.

Truck started running rough loud valve noises.Have 90,000 on rebuilt engine. Good oil pressure not over heating. Pulled driver side valve cover #4 valve is extremely lose, 3/8 or more play.Can i replace the cam and lifters.

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  • four wheeler Dec 06, 2012

    one further thought, the rocker studs are pressed into the heads its possible for 1 or more to pull loose . check that before further tear down .



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Check pushrods , a bent one could do this . if not that probably bad cam . remove and replace cam and lifters it can probably be done without removing engine.

Posted on Dec 05, 2012

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Determining what caused sudden slack in valves would be of concern to me, as in perhaps, changed oil brand, grade or filter incorrect?
Most small block chevy's have adjustable rocker arms. Is that not the case with yours?

Posted on Dec 05, 2012

  • Wes. Treadwell Dec 05, 2012

    I have change oil brands the last case i bought was parts pluse i have ran 10/40 in summer and 10/30 for the last 3yrs took it to local shops they wont touch say i need a new engine,my question is can i pull this intake in one piece i am not familiar with the 350 later than 88 how much differint are the vortecs. Also i was told the injectors could go bad and cause problems. the strange thing to me is no engine codes,drove it 2hrs to get so im sure i trashed the cam . Thanks for you insight Wes

  • Mike Butler
    Mike Butler Dec 06, 2012

    I've had engines that never burned any oil, begin to use a quart every 50 miles, just due to change of brands. As others suggested on here, verify that oil pressure with mechanical gauge first. I'd be tempted to replace oil with well known brand such as Castrol, Mobil, Pennsoil, as well as double check proper filter and replace it as well, if you've confirmed pressure correct and don't see any bent push rods, or defective rocker arms. Always the possibility that whoever rebuilt engine, used cheap aftermarket parts and just those defective need to be replaced. I wouldn't scrap engine until I've exhausted all those possibilities.


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Why can't you adjust the rocker arms?

Posted on Dec 05, 2012

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Posted on Jan 02, 2017

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SOURCE: loses oil pressure

Have u verified the oil pressure with a mechanical guage? this may just be a sending unit, if the engine had no pressure the lifters would be rattling like crazy at idle.

Posted on Dec 28, 2008

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SOURCE: engine is making loud noise from rocker cover area. oil pressure

tapets or camshaft has gone, check them out before you start it again

Posted on Jun 06, 2009

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SOURCE: 2.7 99 dodge intrepid skips when warm

one hydrolic lifter taps after I just spend 2,000 dollers to rebuild the heads they put all new parts on everything. I whant to know if the single hydrolice lifters can be replaced without pulling the head back off. could it be replaced by just pulling the valve cover 2002 dogde entrepid

Posted on Oct 04, 2009

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SOURCE: lifter noise top side both sides got oil presoure

put half a litre of diesel in the oil and three second squirt of fariy liquid ,no cheap stuff allowed ,run for about a week and drain oil,then with the new oil in ,using the cheapest diesel oil you can get repeat again with diesel and fairy ,by this time they should have quitened down a lot,then change oil again using a diesel oil for a turbo truck change filter as well and then change oil every 6000 miles and a filter every third oil change

Posted on Jan 12, 2010

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As far as I know all hydraulic lifters can go bad, collapes or stick. And yours are definately hydraulic lifters, rollered yes, which will make them more durable, but they can go bad. The machine shop should have down a leak-down test on the lifters. That is the only way to determine if the lifters are good. I would check that you have proper oil pressure, I'm sure you do. I bought a "rebuilt head" for a Saturn DOHC engine, and the machine shop never did a leak down test on the lifters, and I had the samething happening.

Posted on Mar 17, 2010

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