So added a Moroso vac pump to the engine. Ended up trying an Aerospace mandrel with 2 pulleys. One for the alternator and one for the vac pump. Pulleys align perfectly. The only issue is the only thing to roll the motor around with is the small allen head bolt that holds the end cap on. Anyone come up with a solution other than tig welding an aluminum nut to the cap? thanks Birdtracker