I measure it on ALL my builds. I make sure it always lands to my specifications to achieve the piston to head clearances that I want. My piston to head clearances on all my builds are greater than stock, but still dependant upon application and RPM range.
What is your protrusion, and what head gaskets are you planning on running?
I should add that stock is 0.010" to 0.031" of piston protrusion. Head gasket thickness depends on manufacturer and type. Cometics come in different thicknesses, Fel-pros are what I use in my puller (with fire rings), I would have to look at my notes at home to see what thickness they are at crush with the headstud torque I use. i don't want to mis quote something as critical as that.
I run them as close to the head as possible, a .010" lower piston allows you to mix&match all new parts, measure protrusion, then deck the block to put it at .028-.030 for a stock head gasket and a little more than that for the fire-ring kit as the gasket doesn't compress as much.
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