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This hydraulic roller tappet is used on the 350 ZZ3 & ZZ4 engines. The duration at lash point in degrees (intake/exhaust) is 275/280 Duration at .050" tappet lift (intake/exhaust) is 208/221 Maximum lift with 1.5:1 rocker ratio (intake/exhaust) is 474/510. Valve lash is zero/zero and lobe centerline is 112 degrees. Lifters not included.Use with Timing chain kit- 12371043Pushrod Kit- 12371041Lifter Kit- 12371042Valve Spring Kit- 12495494Retainer Kit-12495492
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