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How tight can I run valve lash?

Posted By: barracuda7199

How tight can I run valve lash? - 09/11/13 11:40 PM

440 .557 mopar cam calls for .028 intake .032 exhaust. This seems excessive and a waste of lift. How tight can I go before damage occurs? Am I stuck with this lash and need to either let it be or buy a newer design camshaft? I would like to try the small lunati voodoo solid to b honest. Thanks for your time
Posted By: turboduster

Re: How tight can I run valve lash? - 09/12/13 12:09 AM

You being honest means that you want some assurance/permission to buy a new cam. Go for it.
Posted By: oldtimer5151

Re: How tight can I run valve lash? - 09/12/13 12:12 AM

The ramps on the older cams require more lash than the newer. Set it like it says and you wont have any lash problems.
Posted By: WHITEDART

Re: How tight can I run valve lash? - 09/12/13 01:17 AM

12 or 14 thou cold will be fine you might want to check piston to valve
Posted By: Cab_Burge

Re: How tight can I run valve lash? - 09/12/13 03:15 AM

Normally .010 tighter (maybe a tiny bit more) is okay on the loose lash cams like the Mopar and Isky with .028 lash. If it seems to be better with tighter then you need a bigger cam
Posted By: barracuda7199

Re: How tight can I run valve lash? - 09/12/13 03:34 AM

Sounds like I need to break the feeler gauges out. Lunati recommended this cam http://item.mobileweb.ebay.com/viewitem?itemId=171007248992&cmd=VIDESC
What would you recommend?
Posted By: gregsdart

Re: How tight can I run valve lash? - 09/12/13 11:59 AM

Quote:

Normally .010 tighter (maybe a tiny bit more) is okay on the loose lash cams like the Mopar and Isky with .028 lash. If it seems to be better with tighter then you need a bigger cam


I pushed the 590 grind even further, setting the lash down to .014 cold with iron heads. My big stroker liked it. The ramps will be more gentle when you tighten the lash, so the duration goes up, but the first part of the actual lift is a bit lazy. The danger point is not letting the valve seat properly, which with .014 hot shouldn't be an issue at all.
Posted By: Mr.Yuck

Re: How tight can I run valve lash? - 09/12/13 12:10 PM

I ran my old MP 528 solid at .022/.026 It seemed to run better, have more "pull"
Posted By: Thumperdart

Re: How tight can I run valve lash? - 09/12/13 05:28 PM

My Isky solid roller calls for .026 and I set em at .014 cold w/alum. heads which brings it to around .20 hot and never an issue after 8+ years.
Posted By: 383man

Re: How tight can I run valve lash? - 09/12/13 10:37 PM

I ran the .557 cam at .024. Ron
Posted By: Crizila

Re: How tight can I run valve lash? - 09/12/13 10:48 PM

Run my Comp solid blower cam at .012" cold across the board - per spec.
Posted By: barracuda7199

Re: How tight can I run valve lash? - 09/13/13 01:51 AM

Quote:

I ran the .557 cam at .024. Ron


is that hot intake and exhaust?
Posted By: dennismopar73

Re: How tight can I run valve lash? - 09/13/13 02:12 AM


I have seen zero lash,!!! run fast!
Posted By: Thumperdart

Re: How tight can I run valve lash? - 09/13/13 03:12 AM

Quote:


I have seen zero lash,!!! run fast!

On a hydro yes but a solid?
Posted By: 383man

Re: How tight can I run valve lash? - 09/13/13 03:40 AM

Quote:

Quote:

I ran the .557 cam at .024. Ron


is that hot intake and exhaust?



No that was cold on both intake and exh. Ron
Posted By: Duner

Re: How tight can I run valve lash? - 09/13/13 03:51 AM

FWIW - I'm running my Comp hydraulic roller (Magnum SB) with solid roller lifters at .008" cold.
Posted By: dennismopar73

Re: How tight can I run valve lash? - 09/13/13 04:28 AM

Quote:

Quote:


I have seen zero lash,!!! run fast!

On a hydro yes but a solid?


Solid cam ! ran it for awhile ! It did run fast!
so long as a cam can get lubrication!
Posted By: mopartoby

Re: How tight can I run valve lash? - 09/13/13 05:36 AM

Comp said 26 and 28 on my 686 lift solid roller I went 16 and 18 and zero problems
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