Note: 1.7 ratio rocker arms with 7/16" adjusting nuts. The 351C-351M-400 engines equipped with pedestal mount rocker arms require the use of 52655-16 Conversion Kit (no machining required) for street applications. Street/Strip Rocker Arms 13744-16$251.20 Street/Strip Rocker Arm 13744-1$15.70 Pushrod Guideplate Conversion Kit 52655-16$120.00