Subject: ENGINE SERVICE PROGRAM - LT5 5.7L CORVETTE ZR1 ENGINE (VIN CODE J)Model and Year: 1990-92 CORVETTE ZR1Source: Chevrolet Service BulletinBulletin Number: 92-228-6 - (06/01/1992) THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO.... Read More

LT5 Secondary Port Operation & Vacuum Diagnosis by Robert Loszewski Copyright 2001 Before getting into diagnosing the LT5 engine's secondary port vacuum system, I thought it would be a good idea to take this opportunity to clear up a few... Read More

Subject: CAMPAIGN: FUEL LINES MAY CRACK/FUEL LEAK Model and Year: 1990 CHEVROLET CORVETTES WITH LT5 ENGINESSource: Chevrolet Service BulletinBulletin Number: 90-C-10 - (01/30/1990) The National Traffic and Motor Vehicle Safety Act, as amended,... Read More

Subject: LEAKING RADIATOR HOSE SERVICE (REPLACEMENT OF RADIATOR HOSE)Model and Year: 1990 CORVETTE WITH 5.7L (VIN CODE J) ENGINESource: Chevrolet Service BulletinBulletin Number: 90-308-6B - (07/19/1990) TO: ALL CHEVROLET DEALERS Condition: Some of... Read More

Subject: LACK OF WOT-LOW ENGINE POWER REVISED CABLE ADJUSTMENT PROC. Model and Year: 1992 CORVETTE ZR-1 WITH 5.7L ENGINE AND MANUAL TRANSMISSION Source: Chevrolet Product Emission Campaign Bulletin Number: 92-214A-7B - (07/01/1992) THIS... Read More

From Greg Van Deventer, Mercury Marine - October 18, 2000: "The A.L. Dunn cylinder heads have as cast intake and exhaust ports.  All cylinder heads up to that point were from the same mold.  The '90 - '92 cylinder heads were as cast, ... Read More

The correct color code for the 1994 - 1995 Corvette ZR-1 5-spoke wheels is Dupont #C9201 or GM #WH9819. Read More

From Jim Ingle, GM Powertrain Engineer (this question was asked in terms of adding Mobil 1 to a ZR-1 after engine break-in):"There is probably more misunderstanding of lubricants and "old wive's tales" about them than any other automotive issue. A... Read More

The following article appeared in the Spring 2014 issue of the NCRS Corvette Restorer, written by Mike Ingham and is used here with his permission: Adventures In LTPWS Land by Mike Ingham This story concerns the Low Tire Pressure Warning... Read More