We are talking a 50's Thunderbird replica. He is upgrading from what was probably a 60 amp alternator to at least a 100 amp. It will never be worked hard in this application unless he has a lot of electrical goodies added on. Heat will not be an issue. This style alternator has a proven track record of 50 plus years. He has nothing to worry about.
You on the other hand. If your going through alternators like that you have one hell of a draw, ty luck or a wiring issue causing the alternator to fail. I have been working on cars since the early 80's and have never had any car need that many alternators. I spent a couple decades in dealerships and or service shops in various roles and have never had a car eat alternators like that. Most cars the past 25 years or so go their entire lives on the factory alternator. I have several 90's cars with 200k plus on original alternator here in my driveway. Two of which I bought with under 30k miles on them. I have a 2000ish impala I bought from the original owner with just over 300k now. Original engine, trans, and alternator. He only replaced brakes, tires and battery. Your car has an issue or you have horrible luck.
You on the other hand. If your going through alternators like that you have one hell of a draw, ty luck or a wiring issue causing the alternator to fail. I have been working on cars since the early 80's and have never had any car need that many alternators. I spent a couple decades in dealerships and or service shops in various roles and have never had a car eat alternators like that. Most cars the past 25 years or so go their entire lives on the factory alternator. I have several 90's cars with 200k plus on original alternator here in my driveway. Two of which I bought with under 30k miles on them. I have a 2000ish impala I bought from the original owner with just over 300k now. Original engine, trans, and alternator. He only replaced brakes, tires and battery. Your car has an issue or you have horrible luck.