PBM Guideplates are made from high quality heat-treated steel. We offer two types of SBC guideplates, flat and stepped. The stepped series stabilizes the pushrod, reduces the flexing of the pushrod and decreases rocker arm side-to-side movement. PBM has redesigned our 601 flat SBC guideplate. Its elongated rocker stud openings allow for perfect adjustment and alignment of rocker arms to the tip of the valve. We have incorporated a harder material and our surface is much smoother for better pushrod alignment and reduced wear. All guideplates are black oxide finish.