Valve Clearance on Larger Camshaft and Flat Top Pistons

Newbomb Turk said
That’s because ALL rockers flex. All of them.

The entire valve train can deflect.
" When you change stiffness with a better rocker design, something like a stud girdle, stiffer rocker stand, or stiffer push-rod, the deflected lift is higher with less deflection."

Newbomb Turk said
Because ALL rockers worth a **** are not built to the nominal ratio.

"Most are cheated up about a quarter to a half point so that the deflected lift checks very close to the advertised ratio."

Newbomb Turk said
It’s all about rocker flex and accounting for it.

The entire valve train can deflect.