This is what the Optispark looks like. It was very accurate as far as distributors go and they got a bad reputation for a few reasons. 1) The early ones were not vented and not sealed well. A leaking water pump or replacing the thermostat could drench it and we can all imagine how well that works out. 2) Heat!! its sandwiched between the water pump and the front timing cover. 3) Bearing and seal issues not only with the distributor but on the timing cover, a bad seal in both places will leak engine oil inside the dizzy fouling the optical high resolution pickup, and rotors coming loose on the early ones. The later ones are sealed much better and vented, they last longer than an average distributor. The one pictured in the above photo has been on the engine since 2005 and has about 100,000 miles and its still going. It went back on my engine during the upgrading and runs solid with nearly 500 crank horsepower and I turn it to 6800 RPM Pictured here is the distributor installed on the engine you can see it poking out below the water pump
Originally Posted By: HosteenJorje
He made it home. What is the Optispark? Camaro going back in garage for another year. 41 Chevy i6 OHV will be back in driveway. Nice to hear an old Blue Flame six rattling again.