  Quenching effects in strong penguin matrix elements are investigated. A
lattice determination of $\alpha_q^{NS}$, the constant that appears in the
quenched ChPT relevant for the lattice analysis of $K\to\pi\pi$ matrix
elements, shows that this constant is large. The original RBC analysis of $Q_6$
matrix elements is revisited in light of this result. Also, the numerical
effects of choosing the singlet Golterman-Pallante method of quenching $Q_6$ is
investigated.
