Review on 🔧 Optimized Sierra 18-5273 Tune Up Kit for GM V-8 Engines featuring Thunderbolt IV & V HEI Ignitions by Jonathan Clark

Although I have used Sierra parts in the past and have had good luck, this distributor cap did not fit my 1997 5.7LX Mercruiser and became tied to an ID number when attempting to tighten it. The inside diameter of the cap was slightly smaller; probably due to some manufacturing issues and I expect it to tear if I press harder. The cover also looks like a cheaper version of the OEM part. I would skip this one. I have requested a refund and am exchanging for an OEM version. I would say that in this case the abutment is not quite up to the standards and tolerances of the original.