On 27 June 1985, in the CMRI's Mount Saint Michael, having received the commendation of his superiors, he, along with two others, was ordained a priest by Bishop George Musey.

Before his return to Mexico, on 1 February 1991, he left behind a letter expressing his desire to consecrate as bishop whomever the congregation chooses.

[2] On 30 November 1993, in Cincinnati, Ohio, United States, Pivarunas consecrated the sedevacantist Father Daniel Dolan a bishop.

[3] On 11 May 1999, in Acapulco, Guerrero, Mexico, with Dolan assisting as co-consecrator, Pivarunas consecrated Father Martín Dávila of the sedevacantist Sociedad Sacerdotal Trento (Priestly Society of Trent) a bishop.

[3] Since his episcopal consecration, Pivarunas has traveled to the United States, Mexico, Canada, New Zealand, South America, and Europe to provide Confirmation and other sacraments to several thousand children and adults.