Valve adjustment

[GA445]

Running a comp cam 33-244-4 in my 406 with aluminum heads, comp recommends.022 valve lash on ex and intake. The car is street-driven, any other recommendations?

[Tunnelwedge]

That would be a hot lash. Cold around .016"
My BBM's with aluminum rockers grow around .006" hot.
All iron heads and stock rockers grow very little hot maybe .0005 to .001".

[Falcon67]

The consensus seems to be :
Iron block/Iron heads: set per cam card or maybe +.002  Most say per card
Iron/Aluminum: -.006
All aluminum: -.012

There was a good procedure on the Bullet:  set cold per above, heat cycle engine once or twice.  Run engine to op temp, then set one one cylinder to hot spec per cam card.  Let the engine cool, take a reading on that cylinder - there's your cold lash for that engine combination.

[Heo]

The consensus seems to be :
Iron block/Iron heads: set per cam card or maybe +.002  Most say per card
Iron/Aluminum: -.006
All aluminum: -.012

There was a good procedure on the Bullet:  set cold per above, heat cycle engine once or twice.  Run engine to op temp, then set one one cylinder to hot spec per cam card.  Let the engine cool, take a reading on that cylinder - there's your cold lash for that engine combination.

That is what i usualy do

[blykins]

I'm similar.  For iron block/aluminum head combos, you can pretty much count on .006" difference between hot and cold.  I've never seen the lash change here on an iron/iron combo.  The all-aluminum stuff will swell up big time, about .014-.015". 

[Tunnelwedge]

If this is an in car start the best investment is some cheap China valve covers
and cut open the top and you can watch the rockers and adjust them hot.
Then when all the messy stuff is done put the real covers on.

I find the best "fast" method for the hot lash is Fords plan.
I follow the 1967 Intermediate Fairlane Service Manual for adjusting the 427.