Dave's Evo X Build/The Life of Dave blog

[Murlo26]

They were more money yea...but its AMS, to be expected.

AMS said they have tested them up to 800whp on the X and they have used them on 1000whp+ builds on the 8/9. The AMS spec ones simply handle more power.

Not sure the exact differences, but here is some bullet points from the AMS website about the ones i got:

* Specially designed quench area that improves power and reduces the chance of detonation
* Annular pin hole grooves with double forced oil holes to prevent pinhole galling
* Taper lands to prevent scuffing
* Extra thick lands for superior ring groove support under extreme pressure
* 4340 taper bore, hard-chromed extra heavy duty pins for high strength and low weight


Taken from the AMS spec ones from the IX, should be the same features though.