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HDriderTH

  • Karma: +12/-0
Valve Lash
« on: April 22, 2008, 05:23:14 PM »
Ok boys, I need some input. I have two BBCs, iron heads and blocks, both have mechanical cams. I have no idea what cams they are. What I'm trying to figure out is what to set the lash at. Any of you guys run flat tappet cam shafts, what do you set the lash at........Jim.....Ralph..........Pops?
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Ralph Brunt

  • Karma: +51/-0
Re: Valve Lash
« Reply #1 on: April 22, 2008, 05:47:50 PM »
i run solid rollers and on one of them we set it 16/18 cold
on the other its 28/30 hot
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CHEAP, FAST, RELIABLE...PICK 2 CANT HAVE ALL 3
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They are all fukin tasty. My long time favorite, "Dirty Dicks -beerjet-
Quote from: IRRebel on February 16, 2010, 06:11:01 PM
Glasscutter, Skip, OC2  Nordie and many more nail me good every time, relentlessly, I love those guys!

hotrod56cars

  • Karma: +1/-8
Re: Valve Lash
« Reply #2 on: April 22, 2008, 06:05:14 PM »
The Crane Cam solid roller for my BBC is set at .020 hot, both intake and exhaust.
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NO REGRET$ ... Arguing on the internet is like competing in the Special Olympics / no matter how good you do you're still retarded!!!!!

                                                          1978  19' Mach 1 Tunnel jet

429heads

  • Karma: +3/-0
Re: Valve Lash
« Reply #3 on: April 22, 2008, 06:39:34 PM »
I run BBC at 28 26 hot better lose than tight , what are yours set at know might give you a place to start, Have you check lift , and spring pressure on seat and open is this in your
 flat bottom, with blower. What happened to cam card
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bulldawg art

  • Karma: +0/-0
Re: Valve Lash
« Reply #4 on: April 22, 2008, 07:15:24 PM »
I am interested in this topic too. My cam card says .016/.018. Do I set hot or cold?

A
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429heads

  • Karma: +3/-0
Re: Valve Lash
« Reply #5 on: April 22, 2008, 07:48:22 PM »
who made cam you should be able to call them, most set cold no
oil every where, you can cut old valve cover to catch oil or use oil stop on rockers,
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bulldawg art

  • Karma: +0/-0
Re: Valve Lash
« Reply #6 on: April 22, 2008, 08:14:54 PM »
comp cams
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enginedoctor

  • Karma: +7/-0
Re: Valve Lash
« Reply #7 on: April 22, 2008, 09:25:11 PM »
Get with your cam grinder for proper lash... my best advise. :)
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HDriderTH

  • Karma: +12/-0
Re: Valve Lash
« Reply #8 on: April 22, 2008, 09:47:41 PM »
no card, no info. been runnin 'em at .022 cold. jus wanted to get an average.
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speedymopars

  • Karma: +6/-0
Re: Valve Lash
« Reply #9 on: April 23, 2008, 06:32:47 AM »
The newer grinds are all tight lash, .018-.022, the older ones are spec'ed at .028 -.035.

With the improvement in valvespring technology, they can grind the ramps steeper, have tighter lash, and let the valvetrain survive.
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21' 74 cheyenne 543 Mopar Berkeley Jet Place diverter

pw_Tony

  • Karma: +12/-0
Re: Valve Lash
« Reply #10 on: April 23, 2008, 09:39:42 AM »
Quote from: speedymopars on April 23, 2008, 06:32:47 AM
The newer grinds are all tight lash, .018-.022, the older ones are spec'ed at .028 -.035.

With the improvement in valvespring technology, they can grind the ramps steeper, have tighter lash, and let the valvetrain survive.

It's a Chevy, so it probably wants a little tighter. They don't get the pleasure of the Mopar's big ass lifters  ;D
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Josh@JBP

  • Karma: +6/-0
Re: Valve Lash
« Reply #11 on: April 23, 2008, 10:48:27 AM »
Quote from: bulldawg art on April 22, 2008, 07:15:24 PM
I am interested in this topic too. My cam card says .016/.018. Do I set hot or cold?

A
The card typically refers to hot lash, If you are going to set the lash cold Crane recomends adding/subtracting .XXX to what the came card reads:

Iron Block   +   Iron Heads   =  Add .002" 
Iron Block    +  Aluminum Heads   =   Subtract .006" 
Aluminum Block   +  Aluminum Heads   =  Subtract .012"

That should get you close.
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hotrod56cars

  • Karma: +1/-8
Re: Valve Lash
« Reply #12 on: April 23, 2008, 12:42:48 PM »
Quote from: Josh@JBP on April 23, 2008, 10:48:27 AM
The card typically refers to hot lash, If you are going to set the lash cold Crane recomends adding/subtracting .XXX to what the came card reads:

Iron Block   +   Iron Heads   =  Add .002" 
Iron Block    +  Aluminum Heads   =   Subtract .006" 
Aluminum Block   +  Aluminum Heads   =  Subtract .012"

That should get you close.


Thank you!
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NO REGRET$ ... Arguing on the internet is like competing in the Special Olympics / no matter how good you do you're still retarded!!!!!

                                                          1978  19' Mach 1 Tunnel jet

beerjet

  • Karma: +81/-0
Re: Valve Lash
« Reply #13 on: April 23, 2008, 03:39:07 PM »
I dont know what cam is in my boat either . A racer from missouri (sp?) told me 26 both and I always get the motor warmed up before any adjustment . Ran good but runs better at 20/22 int/exh.

-beerjet-
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Quote from: Ralph Brunt on July 09, 2009, 08:36:19 PM
i dont but im all for stuffin shit in her ass to make her go away :-*

speedymopars

  • Karma: +6/-0
Re: Valve Lash
« Reply #14 on: April 23, 2008, 05:44:53 PM »
Quote from: pw_Tony on April 23, 2008, 09:39:42 AM
It's a Chevy, so it probably wants a little tighter. They don't get the pleasure of the Mopar's big ass lifters  ;D

 :-X
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enginedoctor

  • Karma: +7/-0
Re: Valve Lash
« Reply #15 on: April 23, 2008, 05:50:47 PM »
I've seen some tight stuff.....  Be carefull with Valve to piston chasing.  :o
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pw_Tony

  • Karma: +12/-0
Re: Valve Lash
« Reply #16 on: April 23, 2008, 05:52:21 PM »
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speedymopars

  • Karma: +6/-0
Re: Valve Lash
« Reply #17 on: April 23, 2008, 06:26:16 PM »
Quote from: pw_Tony on April 23, 2008, 05:52:21 PM
Did I get it backwards? lol

Nope - what I would call a mild lobe profile would seriously break the chevy. I was just trying to be nice :-)

You should see the grind in my 528 - it pushes the Mopar spec....




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