Jarhead is right, you really have to measure and check the pushrod length. You also have to consider the fact that most heads have been milled and blocks decked, thus shortening the distance between the rocker and the lifter.The other problem I've seen arise is the different lenght valves used when a unknowing machine shop replaces the valves, or the valve seats are sunken from excessive wear or machining. Buy the adjustable push rod from comp and use that to determine the correct lenght. Then order the correct push rods you need. Don't skip this important step, you'll be sorry! Good Luck! J.
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