Note: 11744-16 and 11745-16 are 1.5 ratio rocker arms. 11744-16 contains 3/8" adjusting nuts and 11745-16 contains 7/16" adjusting nuts. 11746-16 and 11747-16 are 1.6 ratio rocker arms. 11746-16 contains 3/8" adjusting nuts and 11747-16 contains 7/16" adjusting nuts. The 1988-99 engines equipped with self-aligning rocker arms require the installation of pushrod guideplates (and 99157-16 7/16" rocker arm studs, if applicable) and appropriate heat treated pushrods in order for these rocker arms to function properly. Valve cover clearance must also be checked. Not suitable for use with center-bolt valve covers. Street/Strip Rocker Arms 11744-16$251.20 Street/Strip Rocker Arms 11745-16$251.20 Street/Strip Rocker Arms 11746-16$251.20 Street/Strip Rocker Arms 11747-16$251.20 7/16" Rocker Arm Studs Set/16 See Product Info 99157-16$64.00