Valve lash question
 

I read an article on Thermal expansion pertaining to valve lash on mechanical cams. I hate doing valves on a hot engine. Crane cams has a guide that states on a iron block and aluminum heads subtract 0.006 on your hot lash if you want to do them cold. Does anyone go by this.

Re: Valve lash question
 

There can be variations between engines and a combination of blocks and heads.
This is what I have done in the past.
Warm up the engine to 150-160, set your hot lash number on one cylinder. Let it sit until it is dead cold. Check the lash and you have determined your cold numbers.

Re: Valve lash question
 

That’s a great idea. I will try that.

Re: Valve lash question
 

most cold lash settings from cam company's are for getting close for starting, they all recommend setting hot for final. that's a good idea for setting hot then check cold

Re: Valve lash question
 

I've used the -.006 rule on my hemi and a wedge and rechecked hot and the results were the same. it's a good rule of thumb after you decide what your valve lash needs to be.