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Re: 1974 Vette - Valve problems
Sounds like the cam lobes are worn. Has it recently been replaced? -
Re: 1974 Vette - Valve problems
Giacomo-----
The best way to adjust the valves is using the cold and "engine off" procedure. You will find this procedure in the Chevrolet Service Manual. It's also in many other engine overhaul manuals and Chilton manuals.
As has been suggested, you may have severely worn camshaft lobes. However, if you adjust the valves using the procedure I mentioned and you still have a problem, you will know that a worn cam is something you need to look at.In Appreciation of John HinckleyComment
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Re: 1974 Vette - Valve SPRINGS
When hot, you can adjust them by sound (which is the best way) because you can fine tune it better than gauging it, but ask yourself this, it seems a little strange that the valves are shutting down one after another. I've seen this before and it sounds like worn valve springs. Because you said the rocker arms were loose and after the adjustment the valves were opening too much,which means you do have cam lobe. Also, while engine idling it may operate just fine until you put it under load, Something to think about. Ken.Comment
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Re: 1974 Vette - Valve problems
when the engine is running back off the rocker arm until you here the "tappit" or clicking sound---adjust the rocker nut clock wise just until the the clicking sound quits---do this on the first (left or right)bank of the engine---turn off the engine and add one turn to the nut---put on the valve cover and do the same to the other bank--- NOTE---when the engine is running and you adjust for zero (no click) and continue for the additional turn you are "hanging" the valve in an open condition and yes it will run rough until the lifter bleeds down---good luckComment
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