Crankshaft rotation

[kchew]

I pulled a long block with a serpentine belt from a late 80's model Astro to put in my boat which has seperate belts for the pulleys (power steering, alternator, water pump) Does the crank rotate in the opposite direction with a serpentine belt then without the serpentine belt? Anybody know?
Thanks for any input!!

[old_master]

Crankshaft rotation of automotive 4.3 engines is the same. However, some engines, (not sure about the 4.3), are produced both ways for use in dual engine marine applications. Counter-rotating engines cancel torque on the hull/transom. Better check yours to be sure. A serpentine belt would be as advantageous in a boat as it is in automotive.

[Blue Bowtie]

While the crank rotates the same direction in 99% of these engines (marine duty included) hte water pump on a poly V ("serpentine") accessory drive does rotate in reverse direction. That can lead to some confusion.