Originally Posted by
4 l-bodies
Standard rollers followers avg. out to be 1.75:1 not 1.84:1. I've seen some NOS roller followers that worked to as high as 1.77:1. They had at least two OEM suppliers. Pivoting followers operate around a pivot point. Therefore their ratios are somewhat variable. With pivoting followers camshafts, it is common practice to measure the valve motion in the engine. You would need a solid lash adjuster to do this properly. However, what you are attempting to do could help identify the camshaft in question without resorting to fully degreeing the camshaft in. Sliders typically had .430 lift while most rollers had .433" lift at max lobe lift. I would measure several intakes and exhausts to get an average lobe lift as many of FWD's camshafts are split overlap.
Some mild regrinds still use the stock 1.400" base circle, while others with the same exact grind profile will have a decreased base circle due to core cam wear.