Ordered this replacement ignition for a 153 Chevy 4 cylinder (120 Mercruiser) Sterndrive. Before installation, I had problems starting the carburetor, a weak spark in the cylinders. I have a spare Mallory distributor with a breakpoint system. I chose the Pertronix replacement because I didn't want to buy special tools or mess with adjustment points. In any case, they were pretty worn out, so I resorted to modern technology. Thanks to this device, my boat ran like new. Starts immediately, no jerking, excellent throttle response. The lack of maintenance is a big bonus. A word to the do-it-yourselfers - after installation I had to adjust the synchronization, the device increased my synchronization by 8 degrees. Also, it's quite difficult to install the plate properly since the bolts that attach it to the manifold body also hold the cover clips and the nuts are underneath. Still an easy install, just be patient.
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