Valve lash question?

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AJ/FormS said:
Before All that I would recommend a leak-test on that cylinder with the valves adjusters backed off. Then after I get a number, I would lightly bop the valve stems with plastic tipped mallet; and see if the leakage number changes. If no change but the number is good, like 4 to 8% max. Then I would check the valve stem heights as already mentioned, to be sure that these two are not suddenly sitting higher than the others. And if they are similar to the others then I would swap the rockers over from another cylinder. And if that makes no difference then it has to be hydrolocked lifters. I know it's the long way around to just popping the lifters out and replacing them, but with this rigmarole you know exactly what is wrong-no guessing.
I too run a very light preload; 1/2 turn. Yeah they have to be adjusted more often, during the break-in; but after that they go many thousands of miles. Years even. And the payback is no lifter pump-up, and an engine that revs until it floats the valves,or starves for oil on the rods and blows up. But there are fixes for those too.
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I will certainly do that! Thank you for the details :)
 
Did you ever find out what was going on ?? My exhaust on #7 is doing the exact same thing.
 
rednesss said:
Did you ever find out what was going on ?? My exhaust on #7 is doing the exact same thing.
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Hey Rednesss, after taking my engine to the machine shop, found out 2 cylinders had previously been bored out of round. Had scuffing on the piston skirts.

I never got to the adjustment problem. I had the machine shop put in a roller cam set up. I have all brand new heads and top end going on this week.

Sorry I could not be more help. Everyone who responded to this post, has given great feedback to help narrow down the problem. I hope one of the ideas gets you an answer. Good luck
 
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