GILBERT CHEVROLET - ARF HYDRA-REV KITS

The AFR 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. This page contains pictures and a description of the Hydra-Rev Kits.
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AFR Hydra-Rev Kits
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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.

Hydra-Rev Kit Part Numbers
Small Block Chevy* with factory lifters Small Block Chevy* with Seal Power or Speed Pro style lifters Small Block Chevy* with factory lifters & twisted wedge heads Small Block Chevy* with twisted wedge heads & Seal Power or Speed Pro style lifters Chevy* V6 with factory lifters Chevy* V6 with Seal Power or Speed Pro style lifters Hydra-Rev Kit Installation Tool	6155 **6150 6156 **6151 6157 **6152 6158
*Except the cast iron LT1 Impala, Vortec truck heads, ProAction Iron Lightning or Dart Iron Eagle. **Will not fit Crane or Lunati Lifters

Hydra-Rev Kit For OEM Lifters	Hydra-Rev Kit For Aftermarket 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.
Below are some pictures of the GILBERT CHEVROLET ZZ383-500 while being built focusing on the OEM P/N 6155 Hydra-Rev Kit and the Special GILBERT CHEVROLET AFR cylinder heads. This combination of the Hydra-Rev Kit and the Special GILBERT CHEVROLET ARF cylinder heads is also used in the GILBERT CHEVROLET Super AFR ZZ4 which produces 464 hp @ 6,100 rpm and 440 ft. /lbs. @ 5,300 rpm while the GILBERT CHEVROLET ZZ383-500 produces a stunning 500 HP @ 5,700 RPM and 491 FT/LBS @ 4,600 RPM.