Tutor Perini (TPC) 10-Q 2003 Q2 Quarterly report

                                                                                                          Exhibit 32.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER PURSUANT TO 18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Perini Corporation (the “Company”) on Form 10-Q for the period ending June 30, 2003 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Ronald N. Tutor, Chairman and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. 1350, as adopted pursuant to 906 of the Sarbanes-Oxley Act of 2002, that:

      (1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

      (2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: August 11, 2003         /s/Ronald N. Tutor
                              Ronald N. Tutor
                              Chairman and Chief Executive Officer

A signed original of this written statement required by Section 906 has been provided to Perini Corporation and will be retained by Perini Corporation and furnished to the Securities and Exchange Commission or its staff upon request.