Crane Hi Intensity Hydraulic Lifters Buick/Cadillac/Olds 62-84*

Crane Cams 99384-16 Hi Intensity "Fast Bleed" Hydraulic Lifters (16 pieces) for

1962-1986 Buick V6 196" thru 252" (12 used),
1964-1980 Buick V8 300" thru 350",
1967-1976 Buick V8 400" thru 455",
1968-1981 Cadillac V8 368" thru 500",
1964-1984 Oldsmobile V8 260" thru 455" (.842" diameter) &
1968-2000 Rover V8 215" (3.5L)-240" (3.9L)-4.2L

Crane´s Hi Intensity hydraulic lifters produce a "variable duration effect". At lower RPMs this can reduce running duration by 6° to 10° and decrease valve lift by .020" to .030". These formerly called "fast bleed" lifters work best with a cam that requires more compression ratio than the engine actually has. They help restore vacuum, cylinder pressure and bottom-end performance. As RPM increases, Hi Intensity lifters act more like normal hydraulic lifters. At 2500 to 3000 RPM they will produce the full duration and lift of the cam.

They should be used only if the engine's compression ratio is below the minimum recommended for the cam you have chosen. These lifters can cause "low speed detonation" if compression is too high. They are slightly noisier than standard hydraulic lifters (but not as noisy as a mechanical lifters) with a maximum RPM potential of 6,500 to 7,000 RPM.

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