Valve Lash Adjustment: running or not?

[Chevy454]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bitfactr</div><div class="ubbcode-body">Thanks for posting the numbers Rick. Saves me searching for them tonight.

Some of the more loose rockers were probably around .015, maybe more. After reading your earlier post, I thought perhaps I should have set them all in the .014-.015 range, since the engine really never gets out of the low end. But the quieter engine, yet better sound, resulting from .012 is nice.

Though driveability felt like it needed a tune-up again, other than just resetting the idle. I'm guessing this isn't uncommon after valve adjustment.

Rob mentioned the tighter lash cam being more finicky. I'm wondering about the margin of error I have in the adjustment. I tried to set it where the .013 would not slide in, .012 would with drag, and .011 easily. So, in theory, my settings should all roughly be between .0115 and .0125.

At would point would a &quot;too tight&quot; adjustment be a problem (i.e. if a valve was set at .010 or tighter, what, if any, damage could occur?)

And, no, I'm not done cleaning it yet [img]<<GRAEMLIN_URL>>/smile.gif[/img]

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Comp could tell you the exact tolerance number for that lobe, but .004&quot; +/- won't hurt a thing. We've played with lash a lot in our Pure Stock class, and although it's a different lobe, we've gone from .020 to .030+, and COPO Pete has deviated more than that on his ZL1...we're stuck with the stock cams, but that's not always the perfect cam, so you have to try and work around it.