Isky Cams Flat Tappet Camshaft - SB Chevy - 547-A Solid Grind - RPM Range 3000-7000 RPM - .547"-.548" Lift, 288-292 Duration, 254-259 Duration @ .050", 106 Lobe Center Quarter-Turn Fastener Adjuster The difference in tape readings

The difference in tape readings is the toe setting

With a 7/16" base thread and a 7/16" rocker thread

lock angle and

Aluminum / Vinyl

1973-1974 Chevrolet El Camino with 6 or 8 cylinder engine without a console

Isky Cams Flat Tappet Camshaft - SB Chevy - 547-A Solid Grind - RPM Range 3000-7000 RPM - .547"-.548" Lift, 288-292 Duration, 254-259 Duration @ .050", 106 Lobe Center Quarter-Turn Fastener Adjuster The difference in tape readingsIsky Flat Tappet Series Cams are designed for Sportsman, UMP, WISOTA and IMCA classes, where reasonably priced cams, capable of producing good overall power and torque are necessary. As the world's largest racing, performance, and economy cam manufacturer, Isky maintains a dynamometer testing program for constant improvement of camshaft and valve train design. These tests are conducted daily in Isky's new enlarged dyno facility. To properly evaluate