ApplicationCompatible for Chevrolet small block 265 1955-1957 4.3L compatible for Chevrolet small block 283 1957-1967 4.6L compatible for Chevrolet small block 327 1962-1969 5.4L compatible for Chevrolet small block 350 1967-2003 5.7L compatible for Chevrolet small block 302 1967-1969 4.9L compatible for Chevrolet small block 307 1968-1973 5.0L compatible for Chevrolet small block 400 1970-1981 6.6L Specifications Lifter Link Bars Included: Yes Lifter Outside Diameter (in): 0.8425 in. Lifter Style: Hydraulic roller Link Bar: Vertical Quantity: Sold as a set of 8 pairs as shownNOTE* Retro-fit for non-roller blocks. * No instruction included; professional installation is suggested. * High performance aftermarket products made in our own lifters factory with more than 10 years experience * A fast and affordable way to easily upgrade your car\'s appearance performance * CNC Machined for Maximum Accuracy * Forged, Heat Treated Chrome Alloy Steel Body for High Strength * Precision Machined and Heat Treated Internal Components