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valve lash

pwDave

pwDave

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Just got my 509 rb started yesterday, the 590 cam spec's I believe called for a setting of .030 and .032, I am running a set of harlon sharp roller rockers and it seems to me that a setting of .026 and.028 would not beat the rockers and related valve gear up as bad, and still be loose enough to get the job done right. what say everyone????
 
You are correct. Rule of thumb is you can always go around .005 tighter with no issues. I ran my .557 cam at .026/.028. It called for the same lash as the .590. I even tried it tighter than that but the engine didn't like it.
 
68 HEMI GTS said:
You are correct. Rule of thumb is you can always go around .005 tighter with no issues. I ran my .557 cam at .026/.028. It called for the same lash as the .590. I even tried it tighter than that but the engine didn't like it.
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Thank you, it always helps to have a little back-up. Dave.
 
HEMI-ITIS said:
I use the vacume gauge along with the feeler .Use it before and after just as a reference.:thumbsup:
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SET the lash at recomended lash and use as a referance point? less vaccum means too tight ?
 
Well I must be the odd man out because I'm running the Mopar 312 590 can in my car and I tighten down my valve lash to 16 all the way across and I'm not have one issue whatsoever and the car runs phenomenal plus you don't hear all that valve train chatter does it also depend on whether you have cast iron or aluminum heads
 
67coronetman said:
Well I must be the odd man out because I'm running the Mopar 312 590 can in my car and I tighten down my valve lash to 16 all the way across and I'm not have one issue whatsoever and the car runs phenomenal plus you don't hear all that valve train chatter does it also depend on whether you have cast iron or aluminum heads
Click to expand...

I believe he's talking about hot lashing so heads don't matter. Also I'm giving him a safe reference. I mean ****, you can run them things a zero if you think it works good, it is the internet after all..
 
68 HEMI GTS said:
I believe he's talking about hot lashing so heads don't matter. Also I'm giving him a safe reference. I mean ****, you can run them things a zero if you think it works good, it is the internet after all..
Click to expand...
Ok then... i miss understood what he was asking..
 
pwDave said:
Just got my 509 rb started yesterday, the 590 cam spec's I believe called for a setting of .030 and .032, I am running a set of harlon sharp roller rockers and it seems to me that a setting of .026 and.028 would not beat the rockers and related valve gear up as bad, and still be loose enough to get the job done right. what say everyone????
Click to expand...
I say we damn sure need to know which cylinder heads you are using and whether or not you are going to set the lash hot or cold.

You've just come to the doctor and asked if you should take one or two aspirin for you pain.

Pain? What pain?

He is going to want to know a lot more about your pain before he gives you an answer.
 
Last edited:
67coronetman said:
Well I must be the odd man out because I'm running the Mopar 312 590 can in my car and I tighten down my valve lash to 16 all the way across and I'm not have one issue whatsoever and the car runs phenomenal plus you don't hear all that valve train chatter does it also depend on whether you have cast iron or aluminum heads
Click to expand...
Well, we know you are odd! But then me too!

You can tighten them suckers down a long ways. It is running them too loose that is a killer.

If it runs better the more you tighten the lash, you probably need a bigger cam. However if it is working to your satisfaction there is no need to change it.
 
Aluminum heads grow more when hot so .005 tighter, you have to remember lash is adjusted for the cam ramp design.
 
I hope my plan is correct, set the lash cold about .004 tighter than the hot setting since I'm using aluminum heads.
 
Ya my plan is do them cold, then check when hot. I have been surprised how the aluminum heads react differently compared to my old iron heads. With my EDE heads, the change from cold to hot seemed stable, meaning it gained about .003 -.004 cold to hot. Hope that's the same with Indy heads.
 
They are eddy victors, small port, w/ Harlan sharp rollers, intake is a .650 offset. I have 75 psi oil pressure @ 1100 rpm. next time I start up I'll let it run long enough to warm up good and yank a valve cover and see where it's at. they where set at .028/.030 at assembly cold, upon start up there wasn't any percepable tappet noise and no misfiring, so I'll check today to be sure all is as it should be! Thanks for the replies fellas, having this much info as backup is a pure luxury. Dave.
 
They are going to be too loose when hot. If you want .028/.030 hot, then I would start at .022/.024 cold. Then check them when the engine is 180 degrees hot.
 
IQ52 said:
They are going to be too loose when hot. If you want .028/.030 hot, then I would start at .022/.024 cold. Then check them when the engine is 180 degrees hot.
Click to expand...
That will be todays project, bring it up to temp and get a valve cover off to check the valve lash, I've some alternator issues that I have to resolve also. thanks for the help IQ and all, Dave.
 
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