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Ultra ARC Rocker Set w/ 1.6 Ratio Ford 289-351W and Olds V8 w/ 7/16" Stud; Constructed in the USA after FEA analysis, the Ultra ARC rocker withstands up to 700 lbs pressure while improving power and stability. These 19044 rockers feature a 1.6 ratio for use with 7/16" stud Ford 289, 302 and 351 Windsor.

Ultra ARC Break-In Rocker Set w/ 1.3 Ratio for Chevrolet SBC w/ 7/16" Stud; Perfect for initial break-in, these Ultra ARC rockers for Chevrolet Small Blocks reduce valve lift by limiting the rocker ratio to 1.3. A great asset to engine builders who prefer to limit the valve lift over removing an inner spring.

Ultra ARC Rocker w/ 1.7 Ratio for Chevrolet Big Block w/ 7/16" Stud; Constructed in the USA after FEA analysis, the Ultra ARC rocker withstands up to 700 lbs pressure while improving power and stability. This 19021 rocker features a 1.7 ratio for use with 7/16" stud Chevrolet 396-454 Big Block.

Ultra ARC Rocker Set w/ 1.7 Ratio for Chevrolet Big Block w/ 7/16" Stud; Constructed in the USA after FEA analysis, the Ultra ARC rocker withstands up to 700 lbs pressure while improving power and stability. These 19018 rockers feature a 1.7 ratio for use with 7/16" stud Chevrolet 396-454 Big Block.

Ultra ARC Rocker w/ 1.72 Ratio for Pedestal Mount GM LS1, LS2, LS6; Constructed in the USA after FEA analysis, the Ultra ARC rocker withstands up to 700 lbs pressure while improving power and stability. This 19024 rocker features a 1.72 ratio for use with pedestal mount Chevrolet LS1/2/6.

Ultra ARC Rocker Set w/ 1.72 Ratio for Pedestal Mount GM LS1, LS2, LS6; Constructed in the USA after FEA analysis, the Ultra ARC rocker withstands up to 700 lbs pressure while improving power and stability. These 19024 rockers feature a 1.72 ratio for use with pedestal mount Chevrolet LS1/2/6.

Ultra ARC Rocker w/ 1.82 Ratio for Pedestal Mount GM LS1, LS2, LS6; Constructed in the USA after FEA analysis, the Ultra ARC rocker withstands up to 700 lbs pressure while improving power and stability. This 19025 rocker features a 1.82 ratio for use with pedestal mount Chevrolet LS1/2/6.

Ultra ARC Rocker Set w/ 1.82 Ratio for Pedestal Mount GM LS1, LS2, LS6; Constructed in the USA after FEA analysis, the Ultra ARC rocker withstands up to 700 lbs pressure while improving power and stability. These 19025 rockers feature a 1.82 ratio for use with pedestal mount Chevrolet LS1/2/6.

Ultra ARC Rocker Set w/ 1.72 Ratio for Pedestal Mount GM LS3/L92; Constructed in the USA after FEA analysis, the Ultra ARC rocker withstands up to 700 lbs pressure while improving power and stability. These 19028 rockers feature a 1.72 ratio for use with pedestal mount Chevrolet LS3/L92.

Ultra ARC Rocker Set w/ 1.82 Ratio for Pedestal Mount GM LS3/L92; Constructed in the USA after FEA analysis, the Ultra ARC rocker withstands up to 700 lbs pressure while improving power and stability. These 19029 rockers feature a 1.82 ratio for use with pedestal mount Chevrolet LS3/L92.

Ultra ARC Rocker w/ 1.6 Ratio for Ford 289-351W w/ 3/8" Stud; Constructed in the USA after FEA analysis, the Ultra ARC rocker withstands up to 700 lbs pressure while improving power and stability. This 19043 rocker features a 1.6 ratio for use with 3/8" stud Ford 289, 302 and 351 Windsor.

Ultra ARC Rocker Set w/ 1.6 Ratio for Ford 289-351W w/ 3/8" Stud; Constructed in the USA after FEA analysis, the Ultra ARC rocker withstands up to 700 lbs pressure while improving power and stability. These 19043 rockers feature a 1.6 ratio for use with 3/8" stud Ford 289, 302 and 351 Windsor.