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AFR Hydra-Rev Kits Hydra-Rev Can Add More Than 100 Horsepower On The Top End! With today’s valve train components and the steep acceleration rates on hydraulic roller cams, it isn’t possible to properly control the valves and valve train by simply increasing valve spring pressure. This usually results in collapsed lifters. AFR has created a solution! The Hydra-Rev applies additional spring pressure to the lifter body, not the plunger. This vastly improves valvetrain stability which results in more power at higher RPM without any loss in low end torque. In testing (see the dyno charts below) Hydra-Rev increased power at 6500 RPM with Comp Cams’ CS280HR10 by more than 100 horsepower! In addition, Hydra-Rev eliminates the danger and the potential damage to components that valve float can cause. The easy to install Hydra-Rev Kits come complete with all the components you need and requires no additional machining or modifications when installed on stock or aftermarket cylinder heads. Hydra-Rev is available now for Chevrolet V8 small block and V6 engines except the cast iron LT1 Impala and Vortec truck heads, Pro Action Iron Lightning or Dart Iron Eagle. If heads are already installed on the engine, a spring installation tool will be required.

Part # Description Price 6155 Small Block Chevy* w/ factory lifters $239 6150 ** Small Block Chevy* w/ Seal Power or Speed Pro style lifters $189 6156 Small Block Chevy* w/ factory lifters & twisted wedge heads $272 6151 Small Block Chevy* w/ twisted wedge heads & Sealed Power or Speed Pro style lifters $209 6157 V6 Chevy w/ factory lifters - 6152 V6 Chevy w/ Sealed Power or Speed Pro style lifters $147 6158 Hydra-Rev Kit Installation Tool $47 * Except the cast iron LT1 Impala, Vortec truck heads, ProAction Iron Lightning or Dart Iron Eagle. ** Will not fit Crane or Lunati Lifters

These tests were conducted in AFR’s digitally controlled dyno facility using a 350 cid Small Block Chevy equipped with AFR 195cc aluminum street heads, Edelbrock RPM Performer #7101, 600 cfm Holley carburetor, 10 to 1 compression ratio, and the camshafts shown in the title of each test.

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