Chevy 505Ci Big Block Cylinder Heads Pushrod
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The lifter cup height in Isky's Red Zone roller lifters is identical to that in its solid lifters, so if you use them on a stock head, stock-length pushrods will work. Patriot Performance, however, uses "plus length" valves (0.250 inch on the intake, 0.100 inch on the exhaust) to allow for the installed spring heights needed with today's high-lift camshafts. JMS used a measuring pushrod to determine the correct pushrod length, which turned out to be 0.100 inch longer than stock. View Related Article
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