Throwing pulley/alternator belt
My belt would come off at High RPM's I put a shut off switch on the alternator. Never threw a belt. But that was at 8500 and above. I have cars here that spin 7500 all day and the belts stay on. You have the wrong pulley on the alternator . You can change the space by adding space behind bracket at the pump and behind the spacer at the head. If you do just one the alternator will be crooked.
Here is the difference. It is about 1/8 but being crooked will also contribute to off set
My belt would come off at High RPM's I put a shut off switch on the alternator. Never threw a belt. But that was at 8500 and above. I have cars here that spin 7500 all day and the belts stay on. You have the wrong pulley on the alternator . You can change the space by adding space behind bracket at the pump and behind the spacer at the head. If you do just one the alternator will be crooked.
Here is the difference. It is about 1/8 but being crooked will also contribute to off set