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Replacement for HP 340 and 360 4 BBL motors. Noticeable idle in 318. Works with 3.23-3.55 gear, dual exhaust and 9:1 compression. K20-212-2 contains the following: 20-212-2 High Energy 218/218 Hydraulic Flat Cam for Chrysler 273-360, 822-16 High Energy Hydraulic Flat Lifter Set for Chrysler 273-360 and 383-440, 3203 High Energy Timing Set for '56-'88 Chrysler 273-360, 901-16 Valve Springs, 604-16 Hardened Steel Set of 16 - 7 Degree, 3/8", 4 Groove Street Locks for Chrysler, 744-16 7 Degree Steel Retainer Set of 16 for 3/8" Valve w/ 1.437"-1.500" Spring, 504-16 Set of 16 Umbrella Valve Seals for Stock Guide Size, 3/8" Valve Stem