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Roller Tip Rocker Arms - Big Block Chevy 7/16" Stud, 1.72 Ratio
These rocker arms offer you the performance advantages of greater durability,
plus feature a roller tip to reduce valve and guide wear The stiffer design
inhibits flex that causes variation in ratios Higher effective ratios allow
more valve lift, and that translates into a 15-30 hp increase.
Roller Tip Rocker Arms - Small Block Chevy 3/8" Stud, 1.52 Ratio