The Opti-spark distributor is positioned on the front of the engine underneath the water pump, and works well in its designed environment–when it works. It isn’t a matter of if your Opti-spark will give you problems; it’s a matter of when. When the Opti-spark first came out in 1992, it was part of a new Chevy engine package dubbed the LT1.

The only known chronic problem, arises when the water pump begins to leak and the seals in the distributor begin to deteriorate, or water begins to condense inside the distributor. From the beginning, the engineers had the forethought to include several small drain holes in the bottom of the distributor, but they weren’t as effective as they were intended to be, causing excess moisture to build up inside. Hence, in 1995 and 1996 the Opti-spark distributor was changed to include a vacuum vent to help remove any moisture that might have formed inside the distributor.

When GM introduced the LT1 engine in the 1992 Corvette, it was a major advance in V8 – push-rod engine technology. Reverse-flow cooling helped it run higher compression ratios on pump gas than ever before. Multi-port fuel injection with a newly designed intake allowed the engine to get incredible fuel economy while maintaining good top end power. Best of all, when GM started installing these engines in the 1993 Camaro/Firebird body series and the 1994 Caprice/Impala SS series, true high-performance small block power was made available to the masses. For the most part, the LT1 earned every bit of the praise it received.

In order to understand the problems with the Opti-Spark Ignition, a brief description of the system is necessary. Simply put, the Opti-Spark was a new distributor design that debuted on the 1992 Chevrolet Corvette LT1 V8. All LT1 (5.7L) and L99 (4.3L) V8 engines made between 1992 and 1997 were equipped with the Opti-Spark distributor. This would include all 1992-1996 Corvette, 1993-1997 Z28 and Trans Am/Formula Firebird, and 1994-1996 Caprice, Impala SS, Buick Roadmaster, and Cadillac Fleetwood applications. The Opti-Spark distributor was driven directly off the front of the camshaft. Consequently, the LT1 and L99 engines featured many design changes from the “old-style” small block to accommodate the new “front-mount” distributor location.

This design was replaced in 1995 with a vacuum-vented Opti-Spark (1994 B-Body cars received the updated Opti-Spark before the F-and Y-Body cars). Along with the new venting provision, the second design featured a redesigned cam drive and a different electrical connector. To determine what particular model you have can be determined by the VIN. Take advantage of the information provided in our GotEngines.com Blog, or if you need a 5.7L engine for sale call the specialists at GotEngines.com @ 1-877-268-0664.