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Billet Pro Shop / Coyote VCT Lockouts
Cam Centerline
Lock Calculator
Pick your cams and your power adder. This gives you the centerline to lock each cam at, and what your valve events and overlap actually end up being once you do.
Your cam grinder already did this work. Use the centerlines printed on the card as your starting point, then bracket from there on the dyno or at the track. This tool shows you what those numbers do to your valve events so you know which direction to move.
Lock here
Intake centerline
113° ATDC
On 211° of duration at .050
Exhaust centerline
119° BTDC
On 211° of duration at .050
Overlap at .050 · the number that matters under boost
-21°
Move it and see what changes
Advance and retard, live
Where your valves end up
Valve events at .050
| Event | Position | Meaning |
|---|
Check your piston to valve clearance. These centerlines are proven starting points, not a substitute for measuring your own combination. Deck height, gasket stack, valve reliefs and spring pressure all move the target. Degree your cams and clay check every build before you run it.