This hydraulic roller tappet is used on the 5.7 liter 350 ZZ3 & ZZ4 HO engines. The duration at lash point in degrees (intake/exhaust) is 275/280; duration at .050" tappet lift (intake/exhaust) is 208/221; and maximum lift with 1.5:1 rocker ratio (intake/exhaust) is 474/501. The valve lash is zero/zero and the intake lobe centerline is 112°. With a mild idle, it makes effective power and torque within the 3500-6500 RPM.

FAQ

How much horsepower do you gain with a roller cam?

• The Chevrolet Performance 10185071 ZZ4 camshaft can offer significant power gains, usually around 20-40 horsepower.
• Actual gains depend on other engine components and tuning.

Is a roller cam better than a hydraulic cam?

• Roller cams, like the ZZ4 camshaft (10185071), generally offer higher RPM capability and increased performance.
• Hydraulic cams may be smoother but have RPM limitations compared to roller cams.

What year was the SBC roller cam?

• The Small Block Chevy (SBC) roller cam was introduced in the mid-'80s, becoming more prevalent in later years.
• General adaptation increased from the late '80s onward.

Can I run a solid roller cam with hydraulic roller lifters?

• No, solid roller cams require specific solid roller lifters, not compatible with hydraulic roller lifters.
• Each cam type requires matched lifters for proper operation.

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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