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Although Gary's engine has just 35,000 miles, it was not well cared for. Sludge levels were high, indicating a lot of stop-and-go driving coupled with infrequent oil changes. Ford sixes with hydraulic lifters had both adjustable and non-adjustable rocker arms depending on when they were produced. This engine has adjustables. Non-adjustable rocker arms for the 200ci six are hard to come by. Adjustable rocker arms utilize a cup-style pushrod for the adjustor where non-adjustable pushrods have rounded tips on both ends.