I received this to replace the original optical spark on a 60,000 mile 1992 Corvette. The original had a noisy bearing but still worked. I've heard many horror stories about aftermarket optic spark units not working at all, but real ones are hard to find and expensive. I decided to try my luck with it. Runs great, engine is very quiet. I completely disassembled it and sealed all interfaces with Three Bond 1184 and coated all screws with Loctite. 1184 is a soft gas/oil resistant sealant, similar to Yamabond 4. There are seals under the cap and body to the aluminium, but there are wide holes where the electrical connector enters the box. Since it is located at the top after installation, any moisture can get directly inside the device. I wanted it to be fully sealed to prevent water from getting in. It has three vents at the bottom, like the standard vent, to release ozone. I didn't do any bleed modifications like the later Opti-Sparks as the original drove 60,000 miles without a bleed. I've ridden it for a few hundred miles and it works great. Seal it before installation. Addendum: 3000 km on it and no problems.
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