Should be all 4 becuase it lists both the intake and exhaust valve closing rates. But it almost looks like a regrind. Not very aggresive at all. It doesnt look like they have the lifts registered right. Its put down to .369 but it says all lifts under a 1:1 rocker arm ratio. Which the duratec is 1:1.8.
Would be interesting to look into though. Even if the grinds are pretty mild. Atleast they are priced within reason
