Remember the pushrods get longer with heat, and so do the valves... most sources I have seen recommend .002 looser than spec lash when cold for iron/iron, but .006 tighter when cold for iron/
True. The mass of the block and heads is much greater than that of the pushrods. Cast iron and steel expand at different rates. I check the cold/hot lash on everything. No two engines are never the same. One thing that has proven out over the years is that I’ve never found a single instance of valve lash closing up with heat. I know it’s all over the web, it’s been published in magazines since before I was born and it still gets said today, but never have I seen lash close up hot on anything.
