Tight lash setting solid flat tappet cam

.001-.002 is about normal lash opening on an iron/iron combo and yet and still you have people today telling other people to set cold lash loose with an iron/iron combo.

It was wrong the first time it was suggested and it will be wrong every time it's suggested.

It's nice to see someone actually measuring and keeping track of important **** like this. Most guys ignore the small stuff and the wonder after the beast when the **** fails.


Ok, rant off.


As for cold lash, it's easier to test on the dyno. Well, not exactly cold lash but lash testing in general. You can sneak up on closing the lash. The first .004 or so with a lash that tight to start with is pretty easy. After that, you've got to be very attentive to idle characteristics and power. When you start getting too tight on the exhaust it will almost feel like you are floating the valves. So be cautious and be very attentive. It's pretty easy to see on the dyno, but you can do it if you are careful.

Like anything else, there is a diminishing return. With lash that tight, you are making greater changes in lash as a percentage with small moves than you are with a cam that lashes at say .028 o some nasty valve train crashing lash like that.