This steel roller is for the 502 and 454 H.O.crate engines.
The duration at .050" tappet lift (intake/exhaust) is 211/230;
Lift with 1.7:1 rocker ratio (intake/exhaust) is 510/540.
Valve lash is zero/zero
Lobe centerline is 112 degrees.
Lifter are not included
For Use in Gen VI Blocks.Can be used in Mark IV and Gen V blocks if aftermarket tie-bar type roller lifters are used along with a Gen VI timing set and thrust plate (Older blocks may need to be drilled and tapped for thrust plate mounting.
Technical Notes: Distributor P/N 1104067 or melonized distribtor gear P/N 10456413 must be used