Vit does stuff the right way and as far as my block I figured after losing a head gasket once last year and then the over rev in July it was wise to have it O ringed while it was at the machine shop .I actually talked to a guy this past weekend at MIR /World Cup finals that had a high hp rsx a beautiful one and he did not have an o ringed block he did however have anti freeze in his engine bay due to blowing coolant out of the overflow from a blown head gasket .