SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D/A (Amendment No. 20) Under the Securities and Exchange Act of 1934 BlackRock Insured Municipal 2008 Term Trust, Inc. (BRM) (Name of Issuer) Common Stock (Title of Class of Securities) 09247k109 (CUSIP Number) George W. Karpus, President Karpus Management, Inc. d/b/a Karpus Investment Management 183 Sullys Trail Pittsford, New York 14534 (585) 586-4680 (Name, Address, and Telephone Number of Person Authorized to Receive Notices and Communications) May 07, 2004 (Date of Event which Requires Filing of this Statement) If the person has previously filed a statement on Schedule 13G to report the acquisition which is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1 (b) (3) or (4), check the following box. [ ] (Page 1 of 5 pages) There are no exhibits. ITEM 1 Security and Issuer Common Stock Blackrock Insured Municipal 2008 Term Trust, Inc. Blackrock Financial Management L. P. 345 Park Ave. 31 St. floor New York, New York 10154 ITEM 2 Identity and Background a) Karpus Management, Inc. d/b/a Karpus Investment Management (?KIM?) George W. Karpus, President, Director and Controlling Stockholder JoAnn VanDegriff, Vice President and Director Sophie Karpus, Director b) 183 Sullys Trail Pittsford, New York 14534 c) Principal business and occupation - Investment Management for individuals, pension and profit sharing plans, corporations, endowments, trust and others, specializing in conservative asset management (i.e. fixed income investments). d) None of George W. Karpus, JoAnn Van Degriff, or Sophie Karpus (?the Principals?) or KIM has been convicted in the past five years of any criminal proceeding (excluding traffic violations). e) During the last five years none of the principals or KIM has been a party to a civil proceeding as a result of which any of them is subject to a judgment, decree or final order enjoining future violations of or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws. f) Each of the Principals is a United States citizen. KIM is a New York corporation. ITEM 3 Source and Amount of Funds or Other Considerations KIM, an independent investment advisor, has accumulated shares of BRM on behalf of accounts that are managed by KIM (?the Accounts?) under limited powers of attorney. All funds that have been utilized in making such purchases are from such Accounts. ITEM 4 Purpose of Transaction KIM has purchased Shares for investment purposes. Being primarily a fixed income manager, with a specialty focus in the closed end fund sector, the profile of BRM fit the investment guidelines for various Accounts. Shares have been acquired since September 28, 1998. ITEM 5 Interest in Securities of the Issuer a) As of the date of this Report, KIM owns 2,678,197 shares, which represents 9.84 % of the outstanding Shares. Karpus Management, Inc. owns 7,150 shares purchased on April 10, 2002 at a price of $15.73 per share (900 shares), April 11 at $15.78 (400 shares), April 25 at $15.91, April 26 at $15.93 (200 shares), April 30 at $15.97 (200 shares), May 1 at $15.97 (300 shares), May 2 and 3 at $15.96 (850 shares), July 12 at $16.19 (600 shares), and January 26, 2004 at $17.44 (3500 shares). George Karpus presently owns 63,800 shares purchased on December 8, 1999 at $13.63 (6000 shares), December 9 at $13.50 (7000 shares), August 17, 2001 at $15.65 (1,000 shares), August 22 at $15.68 (9,000 shares), November 13 at $15.90 (5,000 shares), February 11, 2002 at $15.88 (5000 shares), April 18 at $15.83 (1,500 shares), May 21 at $15.97 (5,000 shares), July 11 at $16.20 (10,000 shares), August 12 at $16.43 (5,000 shares), August 13 at $16.41 (5,000 shares), August 14 at $16.44 (7,900 shares), and August 15 at $16.43 (2,100 shares). He sold on January 17, 2001 at $15.67 (1,800 shares), January 18 at $15.69 (3,700 shares), and January 31 at $15.73 (200 shares). Jo Ann Van Degriff owns 9,000 shares purchased on June 29, 2001 at $15.53 (2000 shares), April 18, 2002 at $15.83 (1,500 shares), May 9 and 10 at $15.90 (1,000 shares), November 13 at $16.54 (2500 shares), and October 14, 2002 at $16.39 (2000 shares). Sophie Karpus presently owns 50 shares purchased on September 18 and 19, 2001 at $15.76 per share (250 shares), and February 20, 2003 at $16.72 (500 shares) and sold on December 23, 2002 at $16.48 (100 shares), January 2, 2003 at $16.51 (100 shares), March 14 at $17.13 (50 shares), March 25 at $16.97 (150 shares), March 26, 27, and 28 at $16.98 (150 shares), April 8 at $16.89 (100 shares), and April 15 at $16.91 (50 shares). None of the other Principals presently owns shares. b) KIM has the sole power to dispose of and to vote all of such Shares under limited powers of attorney. c) The first open market purchase occurred on September 28, 1998 as previously reported. Open market purchases for the last 60 days for the Accounts. There have been no dispositions and no acquisitions, other than by such open market purchases, during such period. DATE SHARES PRICE PER DATE SHARES PRICE PER SHARE SHARE 3/1/2004 -4600 17.67 4/2/2004 8000 17.31 3/2/2004 -100 17.66 4/6/2004 -1000 16.99 3/3/2004 -1050 17.58 4/7/2004 5000 16.98 3/5/2004 -13500 17.67 4/13/2004 -4200 17.00 3/8/2004 -2500 17.66 4/14/2004 150 16.86 3/11/2004 -175 17.70 4/16/2004 2500 16.83 3/12/2004 -5600 17.58 4/21/2004 7000 16.80 3/15/2004 -4400 17.60 4/21/2004 -30025 16.89 3/15/2004 7800 17.55 4/22/2004 -1200 16.86 3/16/2004 5900 17.56 4/23/2004 5000 16.70 3/16/2004 -1900 17.55 4/26/2004 5000 16.61 3/17/2004 -9300 17.61 4/26/2004 -525 16.60 3/19/2004 -7800 17.60 4/27/2004 10000 16.37 3/22/2004 17900 17.49 4/27/2004 -1050 16.44 3/22/2004 -7200 17.49 4/28/2004 160 16.20 3/23/2004 100 17.49 4/29/2004 600 16.11 3/24/2004 11500 17.46 4/30/2004 6600 16.12 3/24/2004 -7580 17.44 4/30/2004 -3700 16.12 3/25/2004 4500 17.50 3/25/2004 -1500 17.45 3/26/2004 3000 17.43 3/26/2004 -4500 17.45 3/29/2004 4000 17.34 The Accounts have the right to receive all dividends from, any proceeds from the sale of the Shares. KIM reserves the right to further accumulate or sell shares. None of the Accounts has an interest in shares constituting more than 5% of the Shares outstanding. ITEM 6 Contracts, Arrangements, Understandings, or Relationships with Respect to Securities of the Issuer. Except as described above, there are no contracts, arrangements, understandings or relationships of any kind among the Principals and KIM and between any of them and any other person with respect to any of BRM securities. ITEM 7 Materials to be Filed as Exhibits Not applicable. Signature After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete, and correct. Karpus Management, Inc. May 07, 2004 By:________________________ Date Signature Dana R. Consler, Vice President Name/Title