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This steel hydraulic roller is used in the 502/502 crate engines. The duration at .050" tappet lift (intake/exhaust) is 224/234 Lift with 1.7:1 rocker ratio (intake/exhaust) is 527/544.Valve lash is zero/zeroLobe centerline is 110 degrees.This cam is intended to be used in Gen VI factory roller blocks. It is possible to use this cam in Mark IV and Gen V blocks if aftermarket tie-bar type lifters are used along with a Gen VI timing set and thrust plate. Some early blocks may need to be drilled and tapped for thrust plate mounting.Lifters are not included.Cam has lobe for mechanical fuel pumpIntended for factory roller blocks - 96' and up. Use with thrust plate and Gen VI timing chain set. Can be used on some Mark IV 454's if the block is machined for the thrust plate and has the two holes under the cam gear - some blocks have this provision, some don't visual inspection is necessary.Single valvespring part # 12462970Technical Notes: Distributor P/N 88961867 or melonized distributor gear P/N 10456413 must be used
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