Rocker Adjustment Cold

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67 gt

A boy who loves his Mopars !
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Hi all just chasing some info as I'm doing some top end work and I will be backing off all rockers, adjustment is 0.16 intake 0.18 Exhaust hot. What would be cold lash adjustment.
318, solid 268 flat tappet EQ mag heads, Crane 1.6 Gold rollers. Thank you
 
Before you back the adjusters off, take a measurement, write it down, problem solved.
 
67 gt said:
Thanks... Why didn't I think if that ???????
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I adjust the rockers on my alum. heads .006-.007 tighter, and call it good, don`t even bother w/ hot adjustment. On iron heads I`ve heard .004 ??????????
 
famous bob said:
I adjust the rockers on my alum. heads .006-.007 tighter, and call it good, don`t even bother w/ hot adjustment. On iron heads I`ve heard .004 ??????????
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With the aluminum heads, did you actually check to see what the "hot" lash is? Or are you just guessing? Be good info if it's verified.
 
I've always done my valve adjustments cold and that's what the cam manufacturers speced. Your lash seems tight to me, especially if that's hot.
 
69_340_GTS said:
With the aluminum heads, did you actually check to see what the "hot" lash is? Or are you just guessing? Be good info if it's verified.
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did when I first put it together, haven`t bothered since. I have plenty of cam, not worried about loosing a couple thou lift, as long as it doesn`t rattle or tighten up.
 
The idea of knowing hot lash, IMO is so you can work on it hot if need be.

Set the lash cold, warm it up fully and check the hot lash and record it. IF you ever have to work on the VT while the engine is hot you know what to do.

My engine builder write the cold and hot lash specs under each valve cover. For reference mine calls for 28/32 cold and I run 24/28 cold.
 
On my 434 with Indy heads there is .004" difference between hot and cold.
 
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