Hydraulic Roller - Xtreme Marine: Good for jet boat with B impeller, 10:1+ compression, running river drags or bracket racing.; 308/314 Advertised Duration, 254/260 Duration .050", .575"/.575" Lift, 112 Lobe Separation; Adjustable valve train required; Must use bronze tip fuel pump pushrod when using high pressure or high volume pump;
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